Connection management: keep one less copy of accept list

Currently, shim layer keeps track of devices added/removed to accept
list and completed connections.
All this is used for logging, and rejecting connect request if accept
list is full.

Controller accept list size on modern devices is 128, so this should
never be reached. To be safe, this logic can be maintained in
connection_manager.cc, where we alread keep track of accept list
devices.

connection_manager.cc puts into dumpsys information on all devices
attempting connection, including wether they are in accept list, and
what clients attempt conneciton.

Therefore, this tracking of accept list becomes redundant and can be
removed.

Test: mma -j32
Bug: 372202918
Flag: EXEMPT, <reason>
Change-Id: I02a56327714a5ed4eaa5219da28160f1095181d8