arm64: dts: renesas: r8a77965: Add IIC-DVFS device node

Populate the device node for the IIC Bus Interface for DVFS (IIC for
DVFS) on R-Car M3-N, and add an alias to fix its bus number.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77965.dtsi

@@ -18,6 +18,10 @@ / {
 	#address-cells = <2>;
 	#size-cells = <2>;
 
+	aliases {
+		i2c7 = &i2c_dvfs;
+	};
+
 	psci {
 		compatible = "arm,psci-1.0", "arm,psci-0.2";
 		method = "smc";
@@ -663,9 +667,17 @@ i2c6: i2c@e66e8000 {
 		i2c_dvfs: i2c@e60b0000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
-
+			compatible = "renesas,iic-r8a77965",
+				     "renesas,rcar-gen3-iic",
+				     "renesas,rmobile-iic";
 			reg = <0 0xe60b0000 0 0x425>;
-			/* placeholder */
+			interrupts = <GIC_SPI 173 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 926>;
+			power-domains = <&sysc 32>;
+			resets = <&cpg 926>;
+			dmas = <&dmac0 0x11>, <&dmac0 0x10>;
+			dma-names = "tx", "rx";
+			status = "disabled";
 		};
 
 		pwm0: pwm@e6e30000 {