[Pod] Move AirplaneModeRepositoryImpl to data/repository/impl

This also moves the interface to that package for now to maintain Git
history, the next CL will move it back out.

Bug: 307607958
Flag: EXEMPT refactor
Test: m SystemUI
Test: atest AirplaneModeRepositoryImplTest
Change-Id: Ia043f2b349d128a213beb778b21d695cf6dec271