input: Add option to toggle pointer icon when using stylus(3/3)

* The visible pointer icon when hovering or drawing with the stylus is
  quite annoying when trying to actually draw with it. Turn it off by
  default and add an option to turn it on.

Forward Port from CM-11.0

Change-Id: Ie4e9e6bcc48803b195d1615d83d6e36d663cc33a