Add the missing pmu_io_domains setting, the gmac can't work well
without this.

Fixes: 2e0537b1 ("arm64: dts: rockchip: Add dts for rockchip rk3566 box demo board")
Signed-off-by: Andy Yan <andyshrk@163.com>
Link: https://lore.kernel.org/r/20221229115043.3899733-1-andyshrk@163.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>