drm/amd/display: Add DCN36 DMCUB

drm/amd/display: Add DCN36 DMCUB

DMCU-B (Display Micro-Controller Unit B) is a display microcontroller
used for shared display functionality with BIOS and for advanced
power saving display features.

Add case to support DCN3.6 as well.

V2: adjust copyright license text

Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Martin Leung <martin.leung@amd.com>
Signed-off-by: Taimur Hassan <Syed.Hassan@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>