Bluetooth: GAP: Reject incoming pairing if already in progress

This patch properly rejects incoming pairing request from remote device
if already in pairing state. Without this patch it was observed that in
some corner cases pairing was auto accepted for remote device while
pairing was in progress with another remote device leading to inconsistent
behaviour.

Change-Id: Iad2d9e98872ab108b141c32543c9508e35632f9d
1 file changed