Fix switch bar in location settings

When user rotates the device in location settings, the swtich bar with
"Use Location" is gone. This change fixes the problem.

Also, remove override getInitialExpandedChildCount() in
LocationSettings. We will use nested PreferenceCategory instead once the
support is ready.

Bug: 73872033
Bug: 70843646
Test: Manual
Change-Id: I343b549398ef2b3d64ca7962b5f2a4ef0441c7f5