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

const btrc_interface_t *btif_rc_get_interface(void)
{
    BTIF_TRACE_EVENT("%s", __FUNCTION__);
 return &bt_rc_interface;
}

const btrc_interface_t *btif_rc_get_interface(void)
{
    BTIF_TRACE_EVENT("%s", __FUNCTION__);
 return &bt_rc_interface;
}
