Property based change to qualify TC_INT_SRC_SIG_SMG_BV_23_C

As Bluedroid AVDTP solution does not use ABORT command
in any of the usecases hence this property based change
is made to pass AVDTP ABORT mandatory TC using PTS.
Affected PTS TC: TC_INT_SRC_SIG_SMG_BV_23_C.
System Property to enable sending ABORT to pass the TC is:
bluetooth.pts.force_a2dp_abort

Bug: 21896912
Change-Id: I71bd11de07b9d8fb15a933712db25f0a93e10dd5