Bluetooth :Fix to avoid the access of JNI gloabal reference object

This is a conrner case where bindandfinish gets called anytime
where adapter state!= STOPPED and calls cleanupNative. Further
while cleanup at lower layer will try to access JNI reference
which is already deleted.

Change-Id: I579bc4015b61ad653f18a5f4a3d26a2508236ff5
CRs-Fixed: 642466