PowerWidget: fix airplane mode toggle

Settings.System -> Settings.Global

Change-Id: Ic1a874ec694e76153d0838fdb81650fe384bae59
Add config_hasRemovableLid

If a device features a dock with a removable lid, lidOpenRotation
overrides the rotation even if it was undocked (technically the lid is
still open).

This setting tells the framework whether to apply lidOpenRotation to
undocked devices.

Change-Id: I1051278a45875b2139b75db28467f9b8de2936d6

Conflicts:
	core/res/res/values/config.xml
	core/res/res/values/symbols.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java