LPC1768: Travis lpc1768 default config test (#8109)

Add a single default travis test for lpc1768 to catch build errors

.travis.yml

@@ -436,3 +436,14 @@ script:
   - pins_set RAMPS X_MAX_PIN -1
   - opt_set_adv Z2_MAX_PIN 2
   - build_marlin_pio ${TRAVIS_BUILD_DIR} ${TEST_PLATFORM}
+
+  #############################
+  # LPC1768 default config test
+  #############################
+
+  - export TEST_PLATFORM="-e LPC1768"
+  - restore_configs
+  - opt_set MOTHERBOARD BOARD_RAMPS_14_RE_ARM_EFB
+  - cp Marlin/Configuration.h Marlin/src/config/default/Configuration.h
+  - cp Marlin/Configuration_adv.h Marlin/src/config/default/Configuration_adv.h
+  - build_marlin_pio ${TRAVIS_BUILD_DIR} ${TEST_PLATFORM}