drm/amd/display: enable assr

[Why]
assr is content protection for eDP, in order to use it we need to call
psp ta (dtm)

[How]
We have a enable_assr callback, hook into this and call the correct psp
cmd id to enable assr.

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>