arm64: dts: qcom: sm8150: add missing qcom,smmu-500 fallback

Since commit 6c84bbd1 ("dt-bindings: arm-smmu: Add generic
qcom,smmu-500 bindings") the SMMU is supposed to use qcom,smmu-500
compatible fallback.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230417080939.28648-1-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sm8150.dtsi

@@ -3974,7 +3974,7 @@ spmi_bus: spmi@c440000 {
 		};
 
 		apps_smmu: iommu@15000000 {
-			compatible = "qcom,sm8150-smmu-500", "arm,mmu-500";
+			compatible = "qcom,sm8150-smmu-500", "qcom,smmu-500", "arm,mmu-500";
 			reg = <0 0x15000000 0 0x100000>;
 			#iommu-cells = <2>;
 			#global-interrupts = <1>;