This adds unit test for microkernel private semaphores.
The code piggybacks to the public semaphores tests (by
including the same source files), so any updates to
the test will be applied to both.
Note that the prj.mdef are different for both tests, since
the private semaphores test move some of the semaphores
inside source code.
Change-Id: Ic318bf6808514c5d335a46cb3e88ebf6000f4c3e
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
