arm64: dts: renesas: r8a77970: add VSPD support

Describe VSPD0 in the R8A77970 device tree; it will be used by DU in
the next patch...

Based on the original (and large) patch by Daisuke Matsushita
<daisuke.matsushita.ns@hitachi.com>.
Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77970.dtsi

@@ -625,6 +625,16 @@ fcpvd0: fcp@fea27000 {
 			power-domains = <&sysc R8A77970_PD_ALWAYS_ON>;
 			resets = <&cpg 603>;
 		};
+
+		vspd0: vsp@fea20000 {
+			compatible = "renesas,vsp2";
+			reg = <0 0xfea20000 0 0x8000>;
+			interrupts = <GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 623>;
+			power-domains = <&sysc R8A77970_PD_ALWAYS_ON>;
+			resets = <&cpg 623>;
+			renesas,fcp = <&fcpvd0>;
+		};
 	};
 
 	timer {