yavta: Update to latest sources

* Update the yavta test utility to the latest sources in the
  git repository.
* Updated the patch by Koen Kooi that allows stdout mode to be
  used to work with the latest sources.
* Added a CFLAGS setting to use the include directory in the
  sources which are more up-to-date and intended to be used
  when building the application.

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>