drm/amd/display: Revert "attempt to fix the logic in commit_planes_for_stream()"

[Description]
Reverts commit "attempt to fix the logic in commit_planes_for_stream()"
since it caused a regression.

Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>