Merge pull request #1486 from Souko/patch-1

Update ultralcd_st7920_u8glib_rrd.h

Marlin/ultralcd_st7920_u8glib_rrd.h

         WRITE(ST7920_CLK_PIN,1);
 
         ST7920_CS();
-        u8g_Delay(90);                 //initial delay for boot up
+        u8g_Delay(120);                 //initial delay for boot up
         ST7920_SET_CMD();
         ST7920_WRITE_BYTE(0x08);       //display off, cursor+blink off
         ST7920_WRITE_BYTE(0x01);       //clear CGRAM ram
-        u8g_Delay(10);                 //delay for CGRAM clear
+        u8g_Delay(15);                 //delay for CGRAM clear
         ST7920_WRITE_BYTE(0x3E);       //extended mode + GDRAM active
         for(y=0;y<HEIGHT/2;y++)        //clear GDRAM
         {