drm/amd/display: Plumb MRQ programming out of DML for dml2_1

drm/amd/display: Plumb MRQ programming out of DML for dml2_1

[Why]
If the MRQ is present then these fields are also required to be
plumbed out to the requestor for programming.

[How]
Pipe the fields out through rq_dlg_get_rq_reg.

The implementation follows the previous generation in dml2_0 for DCN35
but adjusted for the new helpers and coding style of dml2_1.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>