drm/amd/display: Add new DP tunnel bandwidth validation

[Why & How]
Add new function for DP tunnel bandwidth validation.
It uses the estimated BW and allocated BW to validate the timings.

Reviewed-by: PeiChen Huang <peichen.huang@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>