arm64: dts: renesas: r8a77980: add MMC support

Define the generic R8A77980 part of the MMC0 (SDHI2) device node.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77980.dtsi

@@ -353,6 +353,18 @@ GIC_SPI 367 IRQ_TYPE_LEVEL_HIGH
 			dma-channels = <16>;
 		};
 
+		mmc0: mmc@ee140000 {
+			compatible = "renesas,sdhi-r8a77980",
+				     "renesas,rcar-gen3-sdhi";
+			reg = <0 0xee140000 0 0x2000>;
+			interrupts = <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 314>;
+			power-domains = <&sysc 32>;
+			resets = <&cpg 314>;
+			max-frequency = <200000000>;
+			status = "disabled";
+		};
+
 		gic: interrupt-controller@f1010000 {
 			compatible = "arm,gic-400";
 			#interrupt-cells = <3>;