The sys_sem.nouser test does not enable userspace which makes
k_thread_access_grant() no-op. However, XCC would still emit
LOOP instructions for the for-loop. Since there is nothing
to do, the XCC assembler complains about it being an empty
loop and errors out. So guard the k_thread_access_grant()
calls so they are only compiled if userspace is enabled.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
4f2b7c693e