arm64: dts: msm8996: Add SCM DT node

Add SCM DT node to enable SCM functionality on MSM8996.
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/msm8996.dtsi

@@ -248,6 +248,12 @@ psci {
 		method = "smc";
 	};
 
+	firmware {
+		scm {
+			compatible = "qcom,scm-msm8996";
+		};
+	};
+
 	tcsr_mutex: hwlock {
 		compatible = "qcom,tcsr-mutex";
 		syscon = <&tcsr_mutex_regs 0 0x1000>;