Add EEPROM_RESET keycode to core code (#4234)

* Add EEPROM Reset keycode

* Add keycode to docs

* Move EEPROM Reset code to the end of the enum

* Cleanup and naming change

quantum/quantum_keycodes.h

@@ -454,6 +454,8 @@ enum quantum_keycodes {
     TERM_OFF,
 #endif
 
+    EEPROM_RESET,
+
     // always leave at the end
     SAFE_RANGE
 };
@@ -569,6 +571,8 @@ enum quantum_keycodes {
 
 #define KC_GESC GRAVE_ESC
 
+#define EEP_RST EEPROM_RESET
+
 #define CK_TOGG CLICKY_TOGGLE
 #define CK_RST CLICKY_RESET
 #define CK_UP CLICKY_UP