drm/amd/display: parse and check PSR SU caps
[why] Adding a function to read PSR capabilities and ALPM capabilities. Also adding a helper function to validate if the sink and the driver support PSR SU. [how] - isolated all PSR and ALPM reading calls to a separate funciton - set all required PSR caps - added a helper function to check if PSR SU is supported by sink and the driver Reviewed-by: Roman Li <Roman.Li@amd.com> Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Mikita Lipski <mikita.lipski@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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