dt-bindings: i2c: Document r8a7743/5 support

Document i2c Device Tree support for RZ/G1[ME]
(also known as r8aA774[35]) SoCs. They are compatible with
R-Car Gen2 SoC family.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Documentation/devicetree/bindings/i2c/i2c-rcar.txt

@@ -2,6 +2,8 @@ I2C for R-Car platforms
 
 Required properties:
 - compatible:
+	"renesas,i2c-r8a7743" if the device is a part of a R8A7743 SoC.
+	"renesas,i2c-r8a7745" if the device is a part of a R8A7745 SoC.
 	"renesas,i2c-r8a7778" if the device is a part of a R8A7778 SoC.
 	"renesas,i2c-r8a7779" if the device is a part of a R8A7779 SoC.
 	"renesas,i2c-r8a7790" if the device is a part of a R8A7790 SoC.
@@ -12,7 +14,8 @@ Required properties:
 	"renesas,i2c-r8a7795" if the device is a part of a R8A7795 SoC.
 	"renesas,i2c-r8a7796" if the device is a part of a R8A7796 SoC.
 	"renesas,rcar-gen1-i2c" for a generic R-Car Gen1 compatible device.
-	"renesas,rcar-gen2-i2c" for a generic R-Car Gen2 compatible device.
+	"renesas,rcar-gen2-i2c" for a generic R-Car Gen2 or RZ/G1 compatible
+				device.
 	"renesas,rcar-gen3-i2c" for a generic R-Car Gen3 compatible device.
 	"renesas,i2c-rcar" (deprecated)