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

commit d74e766e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>