Allow deferred SUW to add multiple fingerprints

Test: Verified that I could add extra fingerprints in deferred
SUW.
Test: m -j30 RunSettingsRoboTests ROBOTEST_FILTER=FingerprintEnrollIntroductionTest
Fixes: 204846146
Fixes: 223722376

Change-Id: Ib3fc31131e97f13512783ca2bab9d205da3a4044
2 files changed