drm/i915/pm: Hoist pci_save_state()+pci_set_power_state() to the end of pm _late...

drm/i915/pm: Hoist pci_save_state()+pci_set_power_state() to the end of pm _late() hook

drivers/pci does the pci_save_state()+pci_set_power_state() from
the _noirq() pm hooks. Move our manual calls (needed for the
hibernate vs. D3 workaround with buggy BIOSes) towards that same
point. We currently have no _noirq() hooks, so end of _late()
hooks is the best we can do right now.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@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/20250919185015.14561-3-ville.syrjala@linux.intel.com