hammerhead: Set volume last to avoid pops on speaker

Change-Id: I11b3d3c41f014628ac5899d3a3bfea1b7937d7bc
Disable separated DTB build and remove dtbtool

* hammerhead uses DTB appended to zImage (zImage-dtb)

Change-Id: I938c0531130bc76a04494b13411cd95a6d960984
Signed-off-by: Vojtech Bocek <vbocek@gmail.com>
Remove temp fox for bootanimation