Enforce BLUETOOTH_PRIVILEGED permission for FIDO U2F over GATT

All access to external Bluetooth U2F devices must go through system
APIs so that calling apps cannot spoof their idenity.  This change
blocks the whole FIDO U2F service from being accessed.

Change-Id: I122849452c09fb8bc3bff9ead2db1edf64ddfabc
1 file changed