dt-bindings: cache: qcom,llcc: Fix SM8550 description

SM8550 (LLCCv4.1) has 4 register regions, this was not described
between its addition and the restructurization that happened in
the commit referenced in the fixes tag.

Fix it.

Fixes: 43aa006e ("dt-bindings: arm: msm: Fix register regions used for LLCC banks")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230517-topic-kailua-llcc-v1-1-d57bd860c43e@linaro.org

Documentation/devicetree/bindings/cache/qcom,llcc.yaml

@@ -129,6 +129,7 @@ allOf:
               - qcom,sm8250-llcc
               - qcom,sm8350-llcc
               - qcom,sm8450-llcc
+              - qcom,sm8550-llcc
     then:
       properties:
         reg: