Add limitation for the password

The UI allows the password as below cases.
1. empty case
2. at least 4 characters and fewer than 16 characters

Bug: 263698307
Test: build pass and local test pass
Change-Id: Ie1952cde16f4f260be2ca42b00b0de1d21a9f208
Merged-In: I216d91c083dfe36cbda84481a8d0a308cfa8bfa1
2 files changed