Document WifiManager.getConnectionInfo permission

BSSID/SSID can be used to deduce location, so require the same
location permissions for access to these WifiInfo fields
requested using WifiManager.getConnectionInfo() as for
WifiManager.getScanResults().

Bug: 36770596
Test: make offline-sdk-docs
Change-Id: I1dd6d1871f13d669a9504c23ba3b11d769c142f9