Rename to isTetheringFeatureNotChickenedOut

Original name was isTetheringFeatureForceDisabled but it's expected that
the caller of this method will use as `enabled =
!isTetheringFeatureForceDisabled` which is error prune.
So aosp/2711138 renames to isTetheringFeatureNotChickenedOut and updates to
return true if the feature is not disabled.

Bug: 279108992
Test: m
Change-Id: Ia992113e9fb1aee09fcfe48e2b39ca03876063ee
1 file changed