Change include guards in tmk_core/ and drivers/ to pragma once (#11240)

drivers/avr/hd44780.h

@@ -1,5 +1,3 @@
-#ifndef LCD_H
-#define LCD_H
 /*************************************************************************
  Title	:   C include file for the HD44780U LCD library (lcd.c)
  Author:    Peter Fleury <pfleury@gmx.ch>  http://tinyurl.com/peterfleury
@@ -43,6 +41,8 @@
 
 */
 
+#pragma once
+
 #include <inttypes.h>
 #include <avr/pgmspace.h>
 
@@ -346,5 +346,3 @@ extern void lcd_data(uint8_t data);
 #define lcd_puts_P(__s) lcd_puts_p(PSTR(__s))
 
 /**@}*/
-
-#endif  // LCD_H