arm64: dts: qcom: sm8550: add specific SMMU compatible

Generic SMMU compatibles are not allowed alone and we expect specific
one.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230127115513.268843-1-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sm8550.dtsi

@@ -3068,7 +3068,7 @@ data-pins {
 		};
 
 		apps_smmu: iommu@15000000 {
-			compatible = "qcom,smmu-500", "arm,mmu-500";
+			compatible = "qcom,sm8550-smmu-500", "qcom,smmu-500", "arm,mmu-500";
 			reg = <0 0x15000000 0 0x100000>;
 			#iommu-cells = <2>;
 			#global-interrupts = <1>;