drm/amd/display: Promote DC to 3.2.297

- Various DML 2.1 fixes
- Fix module unload
- Fix construct_phy with MXM connector
- Support UHBR10 link rate on eDP
- Revert updated DCCG wrappers

Reviewed-by: Roman Li <roman.li@amd.com>
Signed-off-by: Martin Leung <Martin.Leung@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>