Add @RequiresFeature to setPasswordHistoryLength.

Add the @RequiresFeature(FEATURE_SECURE_LOCK_SCREEN) annotation
to setPasswordHistoryLength for the sake of consistency -
the other password history APIs already have the annotation.

Bug: 123270501
Bug: 111072170
Bug: 111071972
Test: make

Change-Id: I0a321d6bb1b8fb2a4c7ccebfd7c46b2dc9ad8956