qseecom: Propagate correct return value from TZ

When unload app fails, return the correct return
value that we get from TZ and not translate it to
EFAULT. This will make sure that proper handling is
done at the calling side.

Change-Id: Ie850967e5c44b502b888324291a878d0a467b46b
Signed-off-by: Anmolpreet Kaur <anmolpre@codeaurora.org>