[Keyboard] Use GPIO macros for E6 LED in Planck and Preonic default keymaps (#7098)

keyboards/planck/keymaps/default/keymap.c

@@ -209,12 +209,12 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
           backlight_step();
         #endif
         #ifdef KEYBOARD_planck_rev5
-          PORTE &= ~(1<<6);
+          writePinLow(E6);
         #endif
       } else {
         unregister_code(KC_RSFT);
         #ifdef KEYBOARD_planck_rev5
-          PORTE |= (1<<6);
+          writePinHigh(E6);
         #endif
       }
       return false;