drm/radeon: disable runtime pm on PX laptops without dGPU power control

drm/radeon: disable runtime pm on PX laptops without dGPU power control

[ Upstream commit e64c952efb8e0c15ae82cec8e455ab4910690ef1 ]

Some PX laptops don't provide an ACPI method to control dGPU power.  On
those systems, the driver is responsible for handling the dGPU power
state.  Disable runtime PM on them until support for this is implemented.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>