dt-bindings: mfd: qcom,tcsr: Add compatible for MSM8976

Document the qcom,msm8976-tcsr compatible.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221104172122.252761-7-angelogioacchino.delregno@collabora.com

Documentation/devicetree/bindings/mfd/qcom,tcsr.yaml

@@ -17,6 +17,7 @@ properties:
   compatible:
     items:
       - enum:
+          - qcom,msm8976-tcsr
           - qcom,msm8998-tcsr
           - qcom,qcs404-tcsr
           - qcom,sc7180-tcsr