The nor_XXXXX functions may fail due to different reasons, and it
is convenient to do a full check to detect any failure. It is also
a good idea to have a specific function to do a full status check,
because new checks can be added to this function and they will be
incorporated automatically to any function calling it.

Change-Id: I54fed913e37ef574c1608e94139a519426348d12
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>