Revert "drm/radeon/pm: adjust display configuration after powerstate"

This reverts commit 39d42750.

This caused a regression on some older hardware.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=113891



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