drm/amd/display: Acquire DSC HW resource only if required by stream

drm/amd/display: Acquire DSC HW resource only if required by stream

[why]
There are ASICs that have fewer DSC engines than pipes, which makes
DSC a resource that should be used only if required.

[how]
Acquire DSC HW resource if required by stream and release when not
required anymore.

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Acked-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>