ARM: dts: r8a7792: Reserve SRAM for the SMP jump stub

Reserve SRAM for the jump stub for CPU core bringup.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7792.dtsi

@@ -473,6 +473,14 @@ icram0:	sram@e63a0000 {
 		icram1:	sram@e63c0000 {
 			compatible = "mmio-sram";
 			reg = <0 0xe63c0000 0 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0 0xe63c0000 0x1000>;
+
+			smp-sram@0 {
+				compatible = "renesas,smp-sram";
+				reg = <0 0x10>;
+			};
 		};
 
 		sdhi0: sd@ee100000 {