ARM: dts: exynos: Rename SysRAM node to "sram"

The device node name should reflect generic class of a device so rename
the SysRAM node from "sysram" to "sram". The child nodes stay as before
as "smp-sysram" to match their real purpose. This will be also in sync
with upcoming DT schema. No functional change.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/exynos3250.dtsi

···
 		#size-cells = <1>;
 		ranges;
 
-		sysram@2020000 {
+		sram@2020000 {
 			compatible = "mmio-sram";
 			reg = <0x02020000 0x40000>;
 			#address-cells = <1>;

arch/arm/boot/dts/exynos4210.dtsi

···
 	};
 
 	soc: soc {
-		sysram: sysram@2020000 {
+		sysram: sram@2020000 {
 			compatible = "mmio-sram";
 			reg = <0x02020000 0x20000>;
 			#address-cells = <1>;

arch/arm/boot/dts/exynos4412.dtsi

···
 			interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
-		sysram@2020000 {
+		sram@2020000 {
 			compatible = "mmio-sram";
 			reg = <0x02020000 0x40000>;
 			#address-cells = <1>;

arch/arm/boot/dts/exynos5250.dtsi

···
 	};
 
 	soc: soc {
-		sysram@2020000 {
+		sram@2020000 {
 			compatible = "mmio-sram";
 			reg = <0x02020000 0x30000>;
 			#address-cells = <1>;

arch/arm/boot/dts/exynos54xx.dtsi

···
 	};
 
 	soc: soc {
-		sysram@2020000 {
+		sram@2020000 {
 			compatible = "mmio-sram";
 			reg = <0x02020000 0x54000>;
 			#address-cells = <1>;