drm/amd/display: Don't update drm connector when read local EDID

[Why]
Currently, when we're tentatively detecting link configuration under mst
case, we will wrongly notify a none existing stream sink to drm layer.

It's due to we'll call amdgpu_dm_update_connector_after_detect() within
dm_helpers_read_local_edid() to update connector when we're still under
tentative detection procedure.

[How]
dm_helpers_read_local_edid() was designed to do "read" only. Don't
update drm connector status when we're still under detection process.

Tested-by: Daniel Wheeler <[e-mail]>
Reviewed-by: Rodrigo Siqueira <[e-mail]>
Signed-off-by: Wayne Lin <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

···
 		/* We don't need the original edid anymore */
 		kfree(edid);
 
-		/* connector->display_info is parsed from EDID and saved
-		 * into drm_connector->display_info
-		 *
-		 * drm_connector->display_info will be used by amdgpu_dm funcs,
-		 * like fill_stream_properties_from_drm_display_mode
-		 */
-		amdgpu_dm_update_connector_after_detect(aconnector);
-
 		edid_status = dm_helpers_parse_edid_caps(
 						link,
 						&sink->dc_edid,