Adapting all unit tests so:
- main task's prj.mdef is already provided by unified kernel with a
default stack of 2kb.
- unified is the only kernel to be used now, removing unecessary kernel
type make option.
- removing all NANOKERNEL/MICROKERNEL related #ifdefs and so on.
Change-Id: I9b853dbd2aef971d355188cbf7fe2ececaaa80c1
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>