Revert "arm64: zynqmp: Add power domain description for PL"

This reverts commit d59fac2f.

This power domain shouldn't be enabled by default. Power domain behavior
should be handled on case by case basis. Adding this property to
zynqmp.dtsi is breaking some suspend/resume cases that's why remove it
from this file.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/7ed2a46383c6918fbbaca2d618459b1ee58f865c.1697115523.git.michal.simek@amd.com