ARM: dts: r8a7794: 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/r8a7794.dtsi

@@ -596,6 +596,14 @@ 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>;
+		};
 	};
 
 	ether: ethernet@ee700000 {