Add Remote Name Request scheduling to ACL scheduler

Remote name requests need to be queued along with ACL Create Connection
requests to avoid the commands being rejected by the controller. This
adds the relevant hooks into ACL scheduler to do so, analogous to those
that exist for connection creation.

Test: gd unit tests
Bug: 246640776
Tag: #refactor
BYPASS_LONG_LINES_REASON: Bluetooth

Change-Id: Ia6ce5d598eddb771110df44375f9f8256e411132