dt-bindings: arm: renesas: Add Beacon RZ/G2N and RZ/G2H boards

Add beacon,beacon-rzg2n and beacon,beacon-rzg2h to the bindings
list.

Signed-off-by: Adam Ford <aford173@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201213183759.223246-17-aford173@gmail.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>