DO NOT MERGE Do not set sig_id in gerneral reject message per AVDTP SPEC 1.2

AVDTP SPEC 1.3 set sig_id in gerneral reject message. But current stack
is on AVDTP 1.2, we need set the field to be 0.
Setting sig_id would fail PTS test TP/SIG/SMG/BI-28-C

Bug: 17892440
Change-Id: I2037aae299eab15864fc7b53ada7f49c0f34b9c5