arm64: dts: rockchip: actually enable pmu-io-domains on qnap-ts433

Contrary to the vendor-kernel the pmu-io-domains are not enabled by
default. This resulted in the value not being set according to the
regulator, which in turn made the gmac0 interface that is connected
to the vccio4 supply inoperable.

Fixes: 64b7f16f ("arm64: dts: rockchip: add 2 pmu_io_domain supplies for Qnap-TS433")
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20240805162052.3345768-1-heiko@sntech.de