AudioService: fix permission check.
AudioService: fix permission check.

Clear caller identity before calling TelecomManager.isInCall().

Bug: 18702149.
Change-Id: Ie057f3f261fc0a36dff51840cc8390408621d3bd

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base