drm/amd/display: Fix bug with not updating VSP infoframe

[WHY]
Currently, when the VSP infopacket is rebuilt in DM, it is not updated
when being programmed in encoder.

[HOW]
Add new VSP case for update_info_frame

Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>