Add init function to RGBLight driver struct (#23076)

quantum/rgblight/rgblight.c

@@ -247,6 +247,8 @@ void rgblight_init(void) {
         rgblight_mode_noeeprom(rgblight_config.mode);
     }
 
+    rgblight_driver.init();
+
     is_rgblight_initialized = true;
 }
 

quantum/rgblight/rgblight_drivers.c

@@ -7,6 +7,7 @@
 #    include "ws2812.h"
 
 const rgblight_driver_t rgblight_driver = {
+    .init    = ws2812_init,
     .setleds = ws2812_setleds,
 };
 
@@ -14,6 +15,7 @@ const rgblight_driver_t rgblight_driver = {
 #    include "apa102.h"
 
 const rgblight_driver_t rgblight_driver = {
+    .init    = apa102_init,
     .setleds = apa102_setleds,
 };
 

quantum/rgblight/rgblight_drivers.h

@@ -7,6 +7,7 @@
 #include "color.h"
 
 typedef struct {
+    void (*init)(void);
     void (*setleds)(rgb_led_t *ledarray, uint16_t number_of_leds);
 } rgblight_driver_t;