Improve FF-A memory share testing

* Testing SPMC error handling by sending various invalid memory
  transaction descriptors to the SPMC via FFA_MEM_SHARE.
* Validate memory transaction type flag in retrieve response
* Fix error logging in tests

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: If4c4f4084306ec26a7b3033c3efa9ded2a6a52f0
1 file changed