arm64: dts: qcom: msm8996: Fixup smp2p node

The SMEM state property name changes between the integration branch and
mainline, update to use the correct one.

Fixes: 2f45d9fc ("arm64: dts: msm8996: Add SMP2P and APCS nodes")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Sarangdhar Joshi <spjoshi@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

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

@@ -547,7 +547,7 @@ adsp-smp2p {
 
 		adsp_smp2p_out: master-kernel {
 			qcom,entry-name = "master-kernel";
-			#qcom,state-cells = <1>;
+			#qcom,smem-state-cells = <1>;
 		};
 
 		adsp_smp2p_in: slave-kernel {