drm/amd/display: Add Functions to enable Freesync Panel Replay

Add various functions for replay, such as construct, destroy, enable
get_state, and copy_setting etc. These functions communicate with the
firmware to setup and enable panel replay

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>