ARM: dts: r8a77470: Add I2C4 support

Add I2C4 support to RZ/G1C (a.k.a. r8a77470) SoC specific
device tree.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Biju Das <biju.das@bp.renesas.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a77470.dtsi

@@ -237,6 +237,20 @@ icram2:	sram@e6300000 {
 			reg = <0 0xe6300000 0 0x20000>;
 		};
 
+		i2c4: i2c@e6520000 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "renesas,i2c-r8a77470",
+				     "renesas,rcar-gen2-i2c";
+			reg = <0 0xe6520000 0 0x40>;
+			interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 927>;
+			power-domains = <&sysc R8A77470_PD_ALWAYS_ON>;
+			resets = <&cpg 927>;
+			i2c-scl-internal-delay-ns = <6>;
+			status = "disabled";
+		};
+
 		dmac0: dma-controller@e6700000 {
 			compatible = "renesas,dmac-r8a77470",
 				     "renesas,rcar-dmac";