smcinvoke: Update the correct result from qseecom

In case when a listener request comes from secure
side to smcinvoke, we invoke qseecom for processing
of listener request. It maybe the case that after
this request, secure side may request for another
callback request. In this flow, we need to update the
correct result from qseecom as 0 so as to indicate
that qseecom's job was successfully finished and now
smcinvoke has to take care of the callback request further.
This condition is again checked at smcinvoke side and decision
to marshal out is taken accordingly.

Change-Id: I5d6be3292ef11ac2d84fd287bb8f1e9f91dc1b56
Signed-off-by: Anmolpreet Kaur <anmolpre@codeaurora.org>