MAP: Serialize closeService to prevent ANR's

Usecase
1) Connect from carkit
2) Perform BT on/off
3) Repeat step(s) 1 and 2 repeatedly multiple times

Issue:
ANR observed on Bluetooth.

Rootcasue:
Issues in map code, explained below

Fix
- Mark MAPService state to stopped while closeService is ongoing.
  This will avoid extra shutdown message in stop() and fix a relevant
  NPE.
- Do not block for AcceptThread(s) cleanup during shutdown. Fix the
  handler thread blocking to handle BT TURN OFF timeout exception.

Test: ANR not obseved after performing above usecase.

Bug: 35013633
Change-Id: I065a13193200d3aa358abe5d82f1343244b05b97