HW PWM sanity checks for SPINDLE_LASER_FREQUENCY (#18947)

Marlin/src/HAL/DUE/inc/SanityCheck.h

   #endif
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on DUE."
 #endif
 
 #if HAS_TMC_SW_SERIAL

Marlin/src/HAL/ESP32/inc/SanityCheck.h

   #error "EMERGENCY_PARSER is not yet implemented for ESP32. Disable EMERGENCY_PARSER to continue."
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on ESP32."
 #endif
 
 #if HAS_TMC_SW_SERIAL

Marlin/src/HAL/LINUX/inc/SanityCheck.h

   #error "SPINDLE_LASER_PWM_PIN must use SERVO0, SERVO1 or SERVO3 connector"
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on LINUX."
 #endif
 
 #if HAS_TMC_SW_SERIAL

Marlin/src/HAL/LPC1768/fast_pwm.cpp

   LPC176x::pwm_write_ratio(pin, invert ? 1.0f - (float)v / v_size : (float)v / v_size);
 }
 
-#endif // FAST_PWM_FAN || SPINDLE_LASER_PWM
+#endif // NEEDS_HARDWARE_PWM
 #endif // TARGET_LPC1768

Marlin/src/HAL/LPC1768/inc/SanityCheck.h

  */
 static_assert(!(NUM_SERVOS && ENABLED(FAST_PWM_FAN)), "BLTOUCH and Servos are incompatible with FAST_PWM_FAN on LPC176x boards.");
 
+#if SPINDLE_LASER_FREQUENCY
+  static_assert(!NUM_SERVOS, "BLTOUCH and Servos are incompatible with SPINDLE_LASER_FREQUENCY on LPC176x boards.");
+#endif
+
 /**
  * Test LPC176x-specific configuration values for errors at compile-time.
  */

Marlin/src/HAL/SAMD51/inc/SanityCheck.h

   #error "SDIO_SUPPORT is not supported on SAMD51."
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on SAMD51."
 #endif

Marlin/src/HAL/STM32/inc/SanityCheck.h

 //  #error "SPINDLE_LASER_PWM_PIN must use SERVO0, SERVO1 or SERVO3 connector"
 //#endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on STM32."
 #endif
 
 #if ENABLED(SDCARD_EEPROM_EMULATION) && DISABLED(SDSUPPORT)

Marlin/src/HAL/STM32F1/inc/SanityCheck.h

   #error "EMERGENCY_PARSER is not yet implemented for STM32F1. Disable EMERGENCY_PARSER to continue."
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on STM32F1."
 #endif
 
 #if !defined(HAVE_SW_SERIAL) && HAS_TMC_SW_SERIAL

Marlin/src/HAL/STM32_F4_F7/inc/SanityCheck.h

   #error "EMERGENCY_PARSER is not yet implemented for STM32F4/7. Disable EMERGENCY_PARSER to continue."
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on STM32F4/F7."
 #endif
 
 #if HAS_TMC_SW_SERIAL

Marlin/src/HAL/TEENSY31_32/inc/SanityCheck.h

   #error "EMERGENCY_PARSER is not yet implemented for Teensy 3.1/3.2. Disable EMERGENCY_PARSER to continue."
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on Teensy 3.1/3.2."
 #endif
 
 #if HAS_TMC_SW_SERIAL

Marlin/src/HAL/TEENSY35_36/inc/SanityCheck.h

   #error "EMERGENCY_PARSER is not yet implemented for Teensy 3.5/3.6. Disable EMERGENCY_PARSER to continue."
 #endif
 
-#if ENABLED(FAST_PWM_FAN)
-  #error "FAST_PWM_FAN is not yet implemented for this platform."
+#if ENABLED(FAST_PWM_FAN) || SPINDLE_LASER_FREQUENCY
+  #error "Features requiring Hardware PWM (FAST_PWM_FAN, SPINDLE_LASER_FREQUENCY) are not yet supported on Teensy 3.5/3.6."
 #endif
 
 #if HAS_TMC_SW_SERIAL