drm/radeon: add a PX quirk list
commit
4807c5a8a0c87a210c36e3ad74c451a909d88588 upstream.
Some PX laptops seems to have problems turning the dGPU on/off.
Add a quirk list to disable runpm by default on those systems.
Also convert the current PX d3 delay handling to a quirk.
bug:
https://bugzilla.kernel.org/show_bug.cgi?id=51381
https://bugzilla.kernel.org/show_bug.cgi?id=74551
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>