Update char limits for new UDFPS enroll strings

Adds a character limit of 80 for titles and 160 for subtitles to be
shown as part of multi-stage UDFPS enrollment.

Test: Presubmit
Bug: 198847997
Change-Id: Ib85d1dc4f9bb127d641c84411f4dff2736484a5a
(cherry picked from commit 4592bf62)