Move RGBLIGHT_LIMIT_VAL to data driven (#20974)

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

keyboards/rgbkb/pan/config.h

@@ -29,8 +29,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define RGBLIGHT_EFFECT_TWINKLE
 #define RGB_MATRIX_LED_COUNT RGBLED_NUM
 
-#define RGBLIGHT_LIMIT_VAL 120
-
 // RGB Matrix Animation modes. Explicitly enabled
 // For full list of effects, see:
 // https://docs.qmk.fm/#/feature_rgb_matrix?id=rgb-matrix-effects

keyboards/rgbkb/pan/info.json

@@ -11,6 +11,9 @@
     "rgb_matrix": {
         "driver": "custom"
     },
+    "rgblight": {
+        "max_brightness": 120
+    },
     "layouts": {
         "LAYOUT_all": {
             "layout": [