This requires for HDCP 2.2 MST check link.
As for DP/HDMI shims check_2_2_link retrieves the connector
from dig_port, this is not sufficient or DP MST connector,
there can be multiple DP MST topology connector associated
with same dig_port.

Cc: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Tested-by: Karthik B S <karthik.b.s@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210111081120.28417-16-anshuman.gupta@intel.com