Add SettingsMultiSelectListPreference style DO NOT MERGE

There is no OK and CANCEL button when changing APN Bearer.
To fix this issue, OK and CANCEL button should be added to
SettingsMultiSelectListPreference style.

Fixes: 66928311
Test: manual - Add a new APN and tap Bearer

Change-Id: I2b5719a7c1fdb721b15308e0eef7db3e6398e097