Fix UI bugs for udfps enroll in settings.

When the finger is down on the screen and the lighting circle on the sensor is shown, the fingerprint icon is not hidden.
- Udfps enroll view needs to get the touch event on sensor.
  This CL propagates FingerprintManager#onPointerDown and #onPointer to mEnrollmentCallback, which will finally notifies settings.
  However, when AlternateUdfpsTouchProvider is used in UdfpsController, settings doesn't get #onPointerDown and #onPointer. b/263409677 is tracking this.

Test: manually tested on device:
      Turn this flag on via adb command
      adb shell setprop
        sys.fflag.override.settings_show_udfps_enroll_in_settings true
Bug: 260617060
Change-Id: I15581ca1c42cd0213910e50bc81d934ceea354a3