dt-bindings: reset: uniphier: Add NX1 reset control binding

Update reset controller binding document for UniPhier NX1 SoC.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1633399842-1402-3-git-send-email-hayashi.kunihiko@socionext.com


Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>