media: atomisp: Bind and do power-management without firmware

media: atomisp: Bind and do power-management without firmware

The ISP needs to be turned off in a special manner for the SoC
to be able to reach S0i3 during suspend.

When the firmware is missing still bind to the PCI device and
run in pm-only mode which takes care of turning the ISP off
(including turning it off again if the firmware has turned it
on during resume).

In this new pm-only mode the atomisp driver works exactly the same
as the non-staging, pm-only drivers/platform/x86/intel/atomisp2/pm.c
driver.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>