Separate RGBLight/RGB Matrix keycode handling (#23679)

* Separate RGBLight/RGB Matrix keycode handling

* Remove `_DISABLE_KEYCODES` handling

* Update RGB Matrix keycode docs

* Update underglow keycodes for previously migrated boards

* Update keycodes for boards with custom handling

* Fix typos

* Fix bad merge

1 files changed, 2 insertions, 6 deletions

diff --git a/builddefs/common_features.mk b/builddefs/common_features.mk
index a2c88d7e99..cc13fbd3f7 100644
--- a/builddefs/common_features.mk
+++ b/builddefs/common_features.mk
@@ -306,11 +306,11 @@ ifeq ($(strip $(RGBLIGHT_ENABLE)), yes)
         POST_CONFIG_H += $(QUANTUM_DIR)/rgblight/rgblight_post_config.h
         OPT_DEFS += -DRGBLIGHT_ENABLE
         OPT_DEFS += -DRGBLIGHT_$(strip $(shell echo $(RGBLIGHT_DRIVER) | tr '[:lower:]' '[:upper:]'))
+        SRC += $(QUANTUM_DIR)/process_keycode/process_underglow.c
         SRC += $(QUANTUM_DIR)/color.c
         SRC += $(QUANTUM_DIR)/rgblight/rgblight.c
         SRC += $(QUANTUM_DIR)/rgblight/rgblight_drivers.c
         CIE1931_CURVE := yes
-        RGB_KEYCODES_ENABLE := yes
     endif
 
     ifeq ($(strip $(RGBLIGHT_DRIVER)), ws2812)
@@ -456,12 +456,12 @@ ifeq ($(strip $(RGB_MATRIX_ENABLE)), yes)
     COMMON_VPATH += $(QUANTUM_DIR)/rgb_matrix/animations
     COMMON_VPATH += $(QUANTUM_DIR)/rgb_matrix/animations/runners
     POST_CONFIG_H += $(QUANTUM_DIR)/rgb_matrix/post_config.h
+    SRC += $(QUANTUM_DIR)/process_keycode/process_rgb_matrix.c
     SRC += $(QUANTUM_DIR)/color.c
     SRC += $(QUANTUM_DIR)/rgb_matrix/rgb_matrix.c
     SRC += $(QUANTUM_DIR)/rgb_matrix/rgb_matrix_drivers.c
     LIB8TION_ENABLE := yes
     CIE1931_CURVE := yes
-    RGB_KEYCODES_ENABLE := yes
 
     ifeq ($(strip $(RGB_MATRIX_DRIVER)), aw20216s)
         SPI_DRIVER_REQUIRED = yes
@@ -564,10 +564,6 @@ ifeq ($(strip $(RGB_MATRIX_ENABLE)), yes)
     endif
 endif
 
-ifeq ($(strip $(RGB_KEYCODES_ENABLE)), yes)
-    SRC += $(QUANTUM_DIR)/process_keycode/process_rgb.c
-endif
-
 VARIABLE_TRACE ?= no
 ifneq ($(strip $(VARIABLE_TRACE)),no)
     SRC += $(QUANTUM_DIR)/variable_trace.c