ARM: dts: qcom: fix node name for rpm-msg-ram

Adjust the name to match the bindings and fix the following validation
error:

<snip>/arch/arm/boot/dts/qcom-apq8026-huawei-sturgeon.dtb: memory@fc428000: $nodename:0: 'memory@fc428000' does not match '^sram(@.*)?'
From schema: <snip>/Documentation/devicetree/bindings/sram/sram.yaml

Signed-off-by: Luca Weiss <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/dts/qcom-apq8084.dtsi

···
 			#hwlock-cells = <1>;
 		};
 
-		rpm_msg_ram: memory@fc428000 {
+		rpm_msg_ram: sram@fc428000 {
 			compatible = "qcom,rpm-msg-ram";
 			reg = <0xfc428000 0x4000>;
 		};

arch/arm/boot/dts/qcom-msm8226.dtsi

···
 			};
 		};
 
-		rpm_msg_ram: memory@fc428000 {
+		rpm_msg_ram: sram@fc428000 {
 			compatible = "qcom,rpm-msg-ram";
 			reg = <0xfc428000 0x4000>;
 		};

arch/arm/boot/dts/qcom-msm8974.dtsi

···
 			reg = <0xfc400000 0x4000>;
 		};
 
-		rpm_msg_ram: memory@fc428000 {
+		rpm_msg_ram: sram@fc428000 {
 			compatible = "qcom,rpm-msg-ram";
 			reg = <0xfc428000 0x4000>;
 		};