[Fingerprint] Export FingerprintEnrollIntroduction

Export FingerprintEnrollIntroduction activity under the permission
MANAGE_FINGERPRINT so that setup wizard can start it.

Bug: 21695577
Change-Id: If466c6e484a4aa0c10382cfedab0aad10ae26702
(cherry picked from commit 052297172e33ec906a5da10a953be811ff60731c)
3 files changed