Revert "drm/amd/display: more liberal vmin/vmax update for freesync"

commit 1b824eef upstream.

This reverts commit cfb2d418 since it
causes regressions on certain configs. Revert until the issue can be
isolated and debugged.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4238


Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>