dt-bindings: power: renesas,rcar-sysc: Document r8a774e1 SYSC binding

Document bindings for the RZ/G2H (aka R8A774E1) SYSC block.
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>
Link: https://lore.kernel.org/r/1594138692-16816-4-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/power/renesas,rcar-sysc.yaml

@@ -25,6 +25,7 @@ properties:
       - renesas,r8a774a1-sysc # RZ/G2M
       - renesas,r8a774b1-sysc # RZ/G2N
       - renesas,r8a774c0-sysc # RZ/G2E
+      - renesas,r8a774e1-sysc # RZ/G2H
       - renesas,r8a7779-sysc  # R-Car H1
       - renesas,r8a7790-sysc  # R-Car H2
       - renesas,r8a7791-sysc  # R-Car M2-W