drm/radeon/TN: only enable bapm on MSI systems

There still seem to be stability problems with other systems.

Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=72921

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2014-07-21 10:41:13 -04:00
commit 730a336c33