dt-bindings: leds: issi,is31fl319x: Drop 'db' suffix duplicating dtschema

A common property unit suffix '-db' was added to dtschema, thus
in-kernel bindings should not reference the type.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://lore.kernel.org/r/20250811-dt-bindings-db-v1-1-457301523bb5@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>

Author: krzk

Documentation/devicetree/bindings/leds/issi,is31fl319x.yaml

@@ -42,7 +42,6 @@ properties:
     description: GPIO attached to the SDB pin.
 
   audio-gain-db:
-    $ref: /schemas/types.yaml#/definitions/uint32
     default: 0
     description: Audio gain selection for external analog modulation input.
     enum: [0, 3, 6, 9, 12, 15, 18, 21]