dt-bindings: pwm: rcar: Add r8a7744 support

Document RZ/G1N (R8A7744) SoC bindings.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

Documentation/devicetree/bindings/pwm/renesas,pwm-rcar.txt

@@ -3,6 +3,7 @@
 Required Properties:
 - compatible: should be "renesas,pwm-rcar" and one of the following.
  - "renesas,pwm-r8a7743": for RZ/G1M
+ - "renesas,pwm-r8a7744": for RZ/G1N
  - "renesas,pwm-r8a7745": for RZ/G1E
  - "renesas,pwm-r8a7778": for R-Car M1A
  - "renesas,pwm-r8a7779": for R-Car H1