Option to use volume keys to control media volume anytime (2/2)

See Settings part for description

Change-Id: I78d26b0bd41f5b58514ae9c68208a8c950396823

Conflicts:
	core/java/android/provider/Settings.java
input: added support for multiple keyevents

- Multiple keyevents can now be send from the command line:

    input keyevent <key code number or name> ...

  Sometimes invoking 'input' repeatedly does not send the events fast
  enough, this change solves the problem by allowing multiple key code
  number or names be added to the command line.

Change-Id: I0d0f34bddd99e0195c9badff2f8b3e2aa9a51737
audio: Add overlay to fix analog docks.

Of particular interest to devices using libhardware_legacy and
affected by commit 5a484b753cc72d6a50c1dd3bbf68b3403c741a3a: http://goo.gl/rVR1Z
which restricted the routing of AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET
to docks using FORCE_ANALOG_DOCK cases. The EXTRA_DOCK_STATE_CAR case is
returning FORCE_BT_CAR_DOCK, preventing the dock audio from routing properly.

Add an overlay option for overriding to FORCE_ANALOG_DOCK.

Change-Id: Ib7d70c242aa6f537ea5d65098ceb2c591662d8bb