WifiServiceImpl: Clear calling identity before invoking Settings.put

This would otherwise cause an exception when invoked from a
non-system_server process (like CTS).

Bug: 150236894
Test: atest android.net.wifi.cts.WifiManagerTest
Change-Id: I05c7d28381dae8887a259a714bbe9c5309b9d480
1 file changed
tree: a8ff5f9cc1faca17b1e325b3ce9625397936c44f
  1. apex/
  2. service/
  3. PREUPLOAD.cfg