arm64: dts: apple: Re-parent ANS2 power domains

Turns out that the APCIE_ST*_SYS domains do hard-depend on ANS2, so
without this they refuse to power up.

Reviewed-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>