ARM: dts: add GPIO support for Airoha EN7523

Airoha's GPIO controller on their ARM EN7523 SoCs consists of two banks of 32
GPIOs

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20220130145116.88406-14-nbd@nbd.name


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>