selftest: move pokybleeding selftest from meta to meta-poky

meta/ is 'owned' by oe-core and meta-yocto repo should not be
putting files in it.

(From meta-yocto rev: 83be7b1c70a7f90f611ad33284d0b8f963552eae)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>