dt-bindings: pwm: renesas,pwm-rcar: Add r8a774e1 support

Document RZ/G2H (R8A774E1) SoC bindings.

No driver change is needed due to the fallback compatible value
"renesas,pwm-rcar".
Signed-off-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

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

@@ -20,6 +20,7 @@ properties:
           - renesas,pwm-r8a774a1  # RZ/G2M
           - renesas,pwm-r8a774b1  # RZ/G2N
           - renesas,pwm-r8a774c0  # RZ/G2E
+          - renesas,pwm-r8a774e1  # RZ/G2H
           - renesas,pwm-r8a7778   # R-Car M1A
           - renesas,pwm-r8a7779   # R-Car H1
           - renesas,pwm-r8a7790   # R-Car H2