drm/amd/display: Adding stutter entry wm to dce bw struct

Adding the stutter_entry_wm object to dce_bw_output struct
and populating it with bw calculations data

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>