drm/amd/display: Promote DC to 3.2.338

DC v3.2.338 summary:

* DML bug fixes
* Add pwait to DMCUB hang reporting
* New definitions / changes to prep for new platforms.
* Misc cleanups

Signed-off-by: Taimur Hassan <Syed.Hassan@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>