drm/amd/display: Populate chroma prefetch parameters, DET buffer fix

[WHY]
Soft hang/lag observed during 10bit playback + moving cursor, corruption
observed in other tickets for same reason, also failing MPO.

1. Currently, we are always running
   calculate_lowest_supported_state_for_temp_read which is only
   necessary on dGPU
2. Fast validate path does not apply DET buffer allocation policy
3. Prefetch UrgBFactor chroma parameter not populated in prefetch
   calculation

[HOW]
1. Add a check to see if we are on APU, if so, skip the code
2. Add det buffer alloc policy checks to fast validate path
3. Populate UrgentBurstChroma param in call to calculate
   UrgBChroma prefetch values

-revision commits: small formatting/brackets/null check addition + remove test change + dGPU code

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Ausef Yousof <Ausef.Yousof@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>