Move RGBLIGHT_HUE/SAT/VAL_STEP to data driven (#21292)

Co-authored-by: Nick Brassel <nick@tzarc.org>

keyboards/nightly_boards/alter/rev1/config.h

@@ -14,9 +14,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#define RGBLIGHT_HUE_STEP 8
-#define RGBLIGHT_SAT_STEP 8
-#define RGBLIGHT_VAL_STEP 8
 #define RGBLIGHT_EFFECT_BREATHING
 #define RGBLIGHT_EFFECT_RAINBOW_MOOD
 #define RGBLIGHT_EFFECT_RAINBOW_SWIRL

keyboards/nightly_boards/alter/rev1/info.json

@@ -19,6 +19,8 @@
         "scroll_lock": "B4"
     },
     "rgblight": {
+        "saturation_steps": 8,
+        "brightness_steps": 8,
         "led_count": 18,
         "sleep": true
     },