ARM: dts: rzg1: Add generic compatible strings to IIC nodes

According to the Hardware User's Manual, automatic transmission for PMIC
control (DVFS) is not available" on RZ/G1 SoCs.  This really means that
support for automatic DVFS is not present, while the IIC automatic
transmission feature itself is still available, albeit not super useful.

Hence there is no longer a reason not to declare compatibility with the
R-Car Gen2-specific and generic versions.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/573c8ca99f3924a96000fb328a84f1f6d421c6af.1624013699.git.geert+renesas@glider.be

arch/arm/boot/dts/r8a7742.dtsi

@@ -602,7 +602,9 @@ iic2: i2c@e6520000 {
 		iic3: i2c@e60b0000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
-			compatible = "renesas,iic-r8a7742";
+			compatible = "renesas,iic-r8a7742",
+				     "renesas,rcar-gen2-iic",
+				     "renesas,rmobile-iic";
 			reg = <0 0xe60b0000 0 0x425>;
 			interrupts = <GIC_SPI 173 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&cpg CPG_MOD 926>;

arch/arm/boot/dts/r8a7743.dtsi

@@ -552,7 +552,9 @@ iic3: i2c@e60b0000 {
 			/* doesn't need pinmux */
 			#address-cells = <1>;
 			#size-cells = <0>;
-			compatible = "renesas,iic-r8a7743";
+			compatible = "renesas,iic-r8a7743",
+				     "renesas,rcar-gen2-iic",
+				     "renesas,rmobile-iic";
 			reg = <0 0xe60b0000 0 0x425>;
 			interrupts = <GIC_SPI 173 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&cpg CPG_MOD 926>;

arch/arm/boot/dts/r8a7744.dtsi

@@ -552,7 +552,9 @@ iic3: i2c@e60b0000 {
 			/* doesn't need pinmux */
 			#address-cells = <1>;
 			#size-cells = <0>;
-			compatible = "renesas,iic-r8a7744";
+			compatible = "renesas,iic-r8a7744",
+				     "renesas,rcar-gen2-iic",
+				     "renesas,rmobile-iic";
 			reg = <0 0xe60b0000 0 0x425>;
 			interrupts = <GIC_SPI 173 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&cpg CPG_MOD 926>;