Bluetooth: controller: Fix CIS establishment procedures

Fixing typo in llcp_lp_cc_established revealed the need for completing
the CIS establishment procedure by additional call to local/remote
check_done function.

Fixed by exposing lr_check_done and rr_check_done with naming update and
calling after injecting the CIS_ESTABLISHED event.

Signed-off-by: Morten Priess <mtpr@oticon.com>