drm/amd/display: Adding a dc_debug option and dmub setting to use PHY FSM for PSR

drm/amd/display: Adding a dc_debug option and dmub setting to use PHY FSM for PSR

[Why]
PSR Power on/off is done in PSR. Add a dc_debug option
and dmub setting to use PHY implementation of this instead.

[How]
Add a dc_debug option and dmub setting to use
PHY FSM Power up/down for PSR.

Co-authored-by: Shah Dharati <dharati.shah@amd.com>
Reviewed-by: Hansen Dsouza <hansen.dsouza@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Shah Dharati <dharati.shah@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>