DO NOT MERGE Fix potential DoS caused by delivering signal to BT process

Bug: 28885210
Change-Id: I63866d894bfca47464d6e42e3fb0357c4f94d360

 Conflicts:
	btif/co/bta_hh_co.c
	btif/src/btif_core.c
Merge conflict resolution of ag/1161415 (referencing ag/1164670)
- Directly into mnc-mr2-release
(cherry picked from commit 472271b153c5dc53c28beac55480a8d8434b2d5c)

Change-Id: I3839f4e917ee9e71af42f23d2b300632b48400d3
33 files changed