drm/amd/display: Fixes for S0i3 exit

drm/amd/display: Fixes for S0i3 exit

[why & how]
Add debug flag "ignore_pg" to dcn32 PG functions.
Update default z10 support status.
Temp disable RFB features for ASIC.
Remove legacy code path.

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Ovidiu Bunea <ovidiu.bunea@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>