Remove legacy SharedPreference migration

Phonebook and Message bluetooth permissions used to be in
Settings app in Android 4 and removed in Android 5.
These methods are legacy code to support the transition,
and the SharedPreferences are not written to anymore.

Bug: 402789702
Test: pair bt device on a locked automotive build, reboot
and observe no crash
Flag: EXEMPT bugfix only

Change-Id: I1018e7c067c454cd07bbab9b80814bf21415de26