Revert "LinuxKPI: Add pci_power querying for drm-kmod"
This reverts commit 5a612b4409286d2dad5d4b482fca6ccbd8c43186.
This break KBI for drm-kmod.
I prefer to not have full debugfs and that drm-kmod still work.
This is a direct commit to stable/13
Sponsored by: Beckhoff Automation GmbH & Co. KG