drm/amd/display: Update DCN31 for DCN35 support

[Why & How]
Update DCN31 files for DCN35 usage.

Signed-off-by: Qingqing Zhuo <Qingqing.Zhuo@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drm/amd/display: support dynamic HPO DP link encoder allocation

[why]
When there are more DP2.0 RXs connected than the number HPO DP link
encoders we have, we need to dynamically allocate HPO DP link encoder to
the port that needs it.

[how]
Only allocate HPO DP link encoder when it is needed.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drm/amd/display: Add DP 2.0 HPO Link Encoder

HW Blocks:

+--------+ +-----+ +------+
| OPTC | | HDA | | HUBP |
+--------+ +-----+ +------+
| | |
| | |
HPO ====|==========|========|====
| | v |
| | +-----+ |
| | | APG | |
| | +-----+ |
| | | |
| v v v
| +---------------------+
| | HPO Stream Encoder |
| +---------------------+
| |
| v
| +--------------------+
| | HPO Link Encoder |
v +--------------------+

[squash in warning fixes - Alex]

Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>