LocationServiceManager: Fix deadlock due to updateMonitoring.

AppOps can be blocked if askOperation is called from main thread.
This causes location service manager to block while updating monitor
information of all location update receivers.

Fix AppOps to report all askOperation calls from main thread.
Also fix location service manager to handle MODE_ASK.

Change-Id: I085f01e992f60456ad24921bf4ce508ece54e8a6