drm/amd/display: move RMCM programming

[WHY & HOW]
Move only RMCM programming outside of dcn401. Extended HW
definition in dc for memory layout to extend support.

Reviewed-by: Jun Lei <jun.lei@amd.com>
Signed-off-by: Yihan Zhu <Yihan.Zhu@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>