SipService: grab Wi-Fi lock only when necessary.
SipService: grab Wi-Fi lock only when necessary.

Change-Id: Ie432049156e70b6748426b959b653f21bfc504a1

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