arm64: dts: qcom: sm8250: rename smem device node to follow schema

Rename 'qcom,smem' to just 'smem' to follow the rest of SoC (and device
schema).
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20201203191335.927001-2-dmitry.baryshkov@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sm8250.dtsi

@@ -332,7 +332,7 @@ cdsp_secure_heap: memory@8bf00000 {
 		};
 	};
 
-	smem: qcom,smem {
+	smem {
 		compatible = "qcom,smem";
 		memory-region = <&smem_mem>;
 		hwlocks = <&tcsr_mutex 3>;