arm64: dts: renesas: rzg2: Rename i2c_dvfs to iic_pmic

As RZ/G2 SoCs do not support DVFS, the "iic-dvfs" module was renamed to
"iic-pmic" in the RZ/G Series, 2nd Generation User’s Manual: Hardware
Rev. 1.00.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/3fee803a7464a3243e62a943a6a5dce8f1c65a2d.1624016811.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a774a1.dtsi

@@ -25,7 +25,7 @@ aliases {
 		i2c4 = &i2c4;
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
-		i2c7 = &i2c_dvfs;
+		i2c7 = &iic_pmic;
 	};
 
 	/*
@@ -715,7 +715,7 @@ i2c6: i2c@e66e8000 {
 			status = "disabled";
 		};
 
-		i2c_dvfs: i2c@e60b0000 {
+		iic_pmic: i2c@e60b0000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "renesas,iic-r8a774a1",

arch/arm64/boot/dts/renesas/r8a774b1.dtsi

@@ -588,7 +588,7 @@ i2c6: i2c@e66e8000 {
 			status = "disabled";
 		};
 
-		i2c_dvfs: i2c@e60b0000 {
+		iic_pmic: i2c@e60b0000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "renesas,iic-r8a774b1",

arch/arm64/boot/dts/renesas/r8a774c0.dtsi

@@ -574,7 +574,7 @@ i2c7: i2c@e6690000 {
 			status = "disabled";
 		};
 
-		i2c_dvfs: i2c@e60b0000 {
+		iic_pmic: i2c@e60b0000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "renesas,iic-r8a774c0",