Move RGBLIGHT_LIMIT_VAL to data driven (#20974)

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

keyboards/spaceholdings/nebula68/config.h

@@ -27,7 +27,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
   #define RGBLIGHT_HUE_STEP 8
   #define RGBLIGHT_SAT_STEP 8
   #define RGBLIGHT_VAL_STEP 8
-  #define RGBLIGHT_LIMIT_VAL 210 /* The maximum brightness level */
 #define RGBLIGHT_EFFECT_BREATHING
 #define RGBLIGHT_EFFECT_RAINBOW_MOOD
 #define RGBLIGHT_EFFECT_RAINBOW_SWIRL

keyboards/spaceholdings/nebula68/info.json

@@ -12,6 +12,9 @@
         "pin": "A7",
         "driver": "pwm"
     },
+    "rgblight": {
+        "max_brightness": 210
+    },
     "matrix_pins": {
         "cols": ["A13", "A10", "A9", "A14", "A15", "B8", "B9", "C13", "C14", "C15", "A0", "A1", "A2", "A3", "A5"],
         "rows": ["B3", "B4", "B5", "A8", "A4"]