Remove location mode menu from location settings

Location modes were introduced in KitKat. It has made location settings over complicated. In P we are removing location modes to provide simple, meaningful and transparent controls for users.

Bug: 63818349
Bug: 70350519
Test: Robo
Test: Manual
Change-Id: Ic8a168b8eeb3cd2c8b1536c378c92a5f377d3bba