media: platform: cros-ec: Rename conns array for the match table

Rename conns array to port_**_conns, ** is the ports which support cec.
ex: dibbi_conns support Port D and B will be renamed to port_db_conns.
Make it much cleaner and readable.

Signed-off-by: Ken Lin <ken_lin5@hotmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>