Bluetooth HIDD: Remove unplug()

Remove the hidden unplug() API because it is not used and it can cause
the remote device to be unpaired. System apps should use unbond() and
user apps should not use reflection to invoke it.

Bug: 67866553
Test: SL4A
Change-Id: I1bdc06dbb5460c9fd52230b78cbf9434a4349d24
(cherry picked from commit dbc6d14f6ec399e63cee29adbe01fffcb166500f)
1 file changed