Nfc Unlock (1/3)

Adds setting to security where Nfc tags can be added to a list of authorised tags that can bypass the lock screen security

Requires changes to frameworks_base and packages_apps_Settings

Change-Id: I35214253c32687650ae2e2ba7dc54e9cedb10175

Conflicts:
	AndroidManifest.xml
	res/values/strings.xml
	res/xml/security_settings_lockscreen.xml
	res/xml/security_settings_pin.xml