drm/amd/display: Disable TBT3 DSC work around by default.

[Why]
Some TBT3 docks have DPOAs which report USB4 capability and are expected
to support USB4 DPOA features such as FEC/DSC.

[How]
By default, do not override FEC/DSC capabilities reported by TBT3 docks.

Reviewed-by: Meenakshikumar Somasundaram <Meenakshikumar.Somasundaram@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>