Fix YMDK NP21 keyboard to use proper keyboard level functions (#3042)

* Use proper function levels

* Add matrix init functions

* Convert KEYMAP to LAYOUT

Or @mechmerlin is going to hunt me down and harm me... probably :)

* Fix conflict issues

keyboards/ymdk_np21/ymdk_np21.c

@@ -34,7 +34,7 @@ extern rgblight_config_t rgblight_config;
 // @Override
 void matrix_init_kb(void) {
   // call user level keymaps, if any
-  // matrix_init_user();
+  matrix_init_user();
 }
 
 #ifdef BACKLIGHT_ENABLE
@@ -67,7 +67,7 @@ void rgblight_set(void) {
 }
 
 bool rgb_init = false;
-void matrix_scan_user(void) {
+void matrix_scan_kb(void) {
   // if LEDs were previously on before poweroff, turn them back on
   if (rgb_init == false && rgblight_config.enable) {
     i2c_init();
@@ -77,4 +77,6 @@ void matrix_scan_user(void) {
 
   rgblight_task();
   /* Nothing else for now. */
+
+  matrix_scan_user();
 }