drm/amd/display: Do not commit pipe when updating DRR

drm/amd/display: Do not commit pipe when updating DRR

[ Upstream commit 27105a1d92712081072fdf890afc4a8cef11e56c ]

[WHY]
DRR and Pipe cannot be updated on
the same frame, or else underflow will
occur.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>