feat(el3_spmc): ffa error handling in direct msg

When an FFA_ERROR happens while handling a direct message
from normal world, return to normal world with
FFA_ERROR. Otherwise, the system would re-enter the secure partition
with FFA_ERROR.

Change-Id: I3d9a68a41b4815c1a8e10354cfcf68fec9f4b800
Signed-off-by: Levi Yun <yeoreum.yun@arm.com>
1 file changed