drm/radeon: add a dpm quirk list

Disable dpm on certain problematic boards rather than
disabling dpm for the entire chip family since most
boards work fine.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386534
https://bugzilla.kernel.org/show_bug.cgi?id=83731



Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org