Some power domains depends on other domains, Such as Amlogic T7 SoC.
Add parent node to support this case.
Signed-off-by: xianwei.zhao <xianwei.zhao@amlogic.com>
Link: https://lore.kernel.org/r/20230911025223.3433776-3-xianwei.zhao@amlogic.com
[Ulf: Re-based to fit the pmdomain subsystem]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>