DO NOT MERGE Allow simultaneous LE Observe and BTM Inquiry/Scan

This patch allows BTM inquiry and LE observe to be launched
and overlap each others' occurance by redirecting results
and handling states accordingly.

CRs-Fixed: 579505

Conflicts:
	stack/btm/btm_ble_gap.c
bug 12939764

Change-Id: Ifde73f17f8d40e9ebfff3b49e409591189574ee0