arm64: dts: renesas: Add R8A779G0 V4H remoteproc DT node

Describe APMU controller as a remoteproc device capable of starting
the Cortex-R52 cores in Renesas R8A779G0 V4H SoC DT. The APMU IP is
in fact a power management unit capable of additional operations, but
those are not used by U-Boot so far.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

arch/arm/dts/r8a779g0-u-boot.dtsi

@@ -165,6 +165,13 @@
 };
 
 &soc {
+	apmu@e6170000 {	/* Remoteproc */
+		compatible = "renesas,r8a779g0-cr52";
+		reg = <0 0xe6170000 0 0x80000>;
+		power-domains = <&sysc R8A779G0_PD_ALWAYS_ON>;
+		status = "okay";
+	};
+
 	ram@e6780000 {	/* DBSC5 */
 		compatible = "renesas,r8a779g0-dbsc";
 		reg = <0 0xe6780000 0 0x80000>;