iommu: qcom-smmu: add sc7280-smmu-500 compatible

This soc doesn't have the generic compatible.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

drivers/iommu/qcom-hyp-smmu.c

@@ -381,6 +381,7 @@ static struct iommu_ops qcom_smmu_ops = {
 
 static const struct udevice_id qcom_smmu500_ids[] = {
 	{ .compatible = "qcom,sdm845-smmu-500" },
+	{ .compatible = "qcom,sc7280-smmu-500" },
 	{ .compatible = "qcom,smmu-500", },
 	{ /* sentinel */ }
 };