FM HCI: Use mutex while init, send, close HCI

Use mutex while initializing, send HCI commands
and close HCI. This will help with mutual exclusion
when multiple threads sending and/or closing HCI
interface.

CRs-Fixed: 3221629
Change-Id: Ib898a7a5c277f9dd5192d4e17bd7666128d418e8
1 file changed
tree: 97dc7157178b033d9ee687a29c37c67155a27b63
  1. fm_hci/
  2. fmapp2/
  3. helium/
  4. jni/
  5. qcom/