dt-bindings: i2c: rcar: Document r8a7744 support

Document i2c Device Tree support for RZ/G1N (R8A7744) SoC, which is
compatible with R-Car Gen2 SoC family.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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

@@ -3,6 +3,7 @@ I2C for R-Car platforms
 Required properties:
 - compatible:
 	"renesas,i2c-r8a7743" if the device is a part of a R8A7743 SoC.
+	"renesas,i2c-r8a7744" if the device is a part of a R8A7744 SoC.
 	"renesas,i2c-r8a7745" if the device is a part of a R8A7745 SoC.
 	"renesas,i2c-r8a77470" if the device is a part of a R8A77470 SoC.
 	"renesas,i2c-r8a774a1" if the device is a part of a R8A774A1 SoC.