Add SettingsShim for tethering module

Add SettingsShim to handle checkAndNoteWriteSettingsOperation API which
has two different version between R and S.

Bug: 182211575
Test: install S module to R device and both run mts tests build with S
and R.

Change-Id: I9dbe87ecbc3964a47fa04af7d1e0f1ab105185c9