gd_acl: Remove redundant call stack/l2cap/l2c_link

Previous arch had l2cap driving the btm layer.
The new legacy acl/btm layer sits between the l2cap
layer and the hci layer.  The call path has
already been exercised by this time and is called twice

Bug: 163134718
Tag: #refactor
Test: gd/cert/run --host

Change-Id: I8e83a79020f0c9cdfaab0916af1a8e2028e130ca