Revert "Revert drm/amd/display: Enable Freesync Video Mode by default"

Revert "Revert drm/amd/display: Enable Freesync Video Mode by default"

[ Upstream commit 11b92df8a2f7f4605ccc764ce6ae4a72760674df ]

This reverts commit 4243c84aa082d8fba70c45f48eb2bb5c19799060.

Enables freesync video by default, since the hang and corruption issue
on eDP panels are now fixed.

Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Rodrigo Siqueira <rjordrigo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>