Set the proper authentication level for AvOpen

During Avopen security was made none hence A2DP
connection was happening without bonding when
DUT is paired with DUT and then pairing entry
is deleted from remote and then only A2dp is
tried to be reconnected from DUT. A2dp appears
to be connected in this usecase but the device
entry is shown in available devices list instead
of paired one.
Changes made from No security to SEC Authenticate

Change-Id: I7fc39fe8acef874f0031c9b78d4269a62b94e4b0