Add support for the DIO (Display IO) block of DCN3.1 which controls
legacy HDMI/DP stream/link encoding.
HW Blocks:
+--------+ +--------+
| DIO | | DCCG |
+--------+ +--------+
Includes some updates to core logic for link encoder assignment and
future support for new high bandwidth output.
v2: squash in unused variable fix (Alex)
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
cbaf919f33