drm/i915/pm: Drop redundant pci stuff from suspend/resume paths

drm/i915/pm: Drop redundant pci stuff from suspend/resume paths

I don't think there should be any need for us to call any of
pci_enable_device(), pci_disable_device() or pci_set_master()
from the suspend/resume paths. The config space save/restore should
take care of all of this.

Cc: Karthik Poosa <karthik.poosa@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250919185015.14561-7-ville.syrjala@linux.intel.com