qseecom: Add re-entrancy changes in qseecom.c

Add re-entrancy changes in qseecom.c. When one
secure app is waiting on a listener, another client
can call into a different app if the second app
does not use a listener service or is using a
different listener service.

Change-Id: Ie7fb4a9fb78adedcb223308cd11335bf6a48296e
Signed-off-by: Zhen Kong <zkong@codeaurora.org>