Add DD mapping for LED/RGB Matrix max brightness (#18403)

data/mappings/info_config.json

@@ -38,6 +38,7 @@
     "LED_COMPOSE_PIN": {"info_key": "indicators.compose"},
     "LED_KANA_PIN": {"info_key": "indicators.kana"},
     "LED_PIN_ON_STATE": {"info_key": "indicators.on_state", "value_type": "int"},
+    "LED_MATRIX_MAXIMUM_BRIGHTNESS": {"info_key": "led_matrix.max_brightness", "value_type": "int"},
     "MANUFACTURER": {"info_key": "manufacturer", "value_type": "str"},
     "MATRIX_HAS_GHOST": {"info_key": "matrix_pins.ghost", "value_type": "bool"},
     "MATRIX_IO_DELAY": {"info_key": "matrix_pins.io_delay", "value_type": "int"},
@@ -77,6 +78,7 @@
     "RGBLIGHT_VAL_STEP": {"info_key": "rgblight.brightness_steps", "value_type": "int"},
     "RGBLIGHT_SLEEP": {"info_key": "rgblight.sleep", "value_type": "bool"},
     "RGBLIGHT_SPLIT": {"info_key": "rgblight.split", "value_type": "bool"},
+    "RGB_MATRIX_MAXIMUM_BRIGHTNESS": {"info_key": "rgb_matrix.max_brightness", "value_type": "int"},
     "RGBW": {"info_key": "rgblight.rgbw", "value_type": "bool"},
     "PRODUCT": {"info_key": "keyboard_name", "warn_duplicate": false, "value_type": "str"},
     "PRODUCT_ID": {"info_key": "usb.pid", "value_type": "hex"},

data/schemas/keyboard.jsonschema

@@ -265,6 +265,7 @@
             "type": "object",
             "properties": {
                 "driver": {"type": "string"},
+                "max_brightness": {"$ref": "qmk.definitions.v1#/unsigned_int_8"},
                 "layout": {
                     "type": "array",
                     "items": {
@@ -292,6 +293,7 @@
             "type": "object",
             "properties": {
                 "driver": {"type": "string"},
+                "max_brightness": {"$ref": "qmk.definitions.v1#/unsigned_int_8"},
                 "layout": {
                     "type": "array",
                     "items": {