Fix HTC headset handling.

HTC's headset driver adds additional bits to the switch state, which
we're unable to deal with. Fix that by masking out those bits and
keeping only the valid ones.

Change-Id: I29f0de9520ebb56d61acbc9a6dfcfc73e1f297d8
Merge "Fix HTC headset handling." into cm-10.1
Adds ability to answer call with hardware HOME button (preparation to winter time)

Change-Id: Ic11449acf87c6b4d932142b74158af7441658b3d

Patch set 1 : Upload the change
Patch set 2 : Only change the real Author
Patch set 3 : Bugfix:
              Add register for the ContentObserver (Settings.Secure.RING_HOME_BUTTON_BEHAVIOR) in PhoneWindowManager,
              and correcting the logging functions and deleting some unneeded comments
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