Use the internal max faces number to check enrolled.

Test: manually tested on device
Test: robotest for FaceEnrollIntroductionTest
Bug: 243759589
Change-Id: I193c7b7c49f884541bd5d8282d15bf69e46f3392
Merged-In: I193c7b7c49f884541bd5d8282d15bf69e46f3392
(cherry picked from commit b4000fb22666f1179bb99c9a2b281bf040f983fd)
1 file changed