As suggested by @benzea

, the following cleanup actions have been
performed:

  - let case order match enroll states enum

  - remove FP_ENROLL_IDENTIFY that is no longer used

  - finally use fpi_ssm_next_state instead of explicitly jumping to
    FP_ENROLL_CREATE

Additionally, all types/functions/variables referring to "enroll_init"
used for FP_ENROLL_CREATE have been renamed to match "enroll_create".
All other states use similar name matching.

Signed-off-by: Enrik Berkhan <Enrik.Berkhan@inka.de>