qseecom: Fix failure to release qseecom handle

qseecom_release() returns a failure, if it is unable to find
app_id of zero, associated with the handle in the app list.

There exists scenarios where the handle may not have the
app_id initialized and remain to be 0.  In these scenarios,
once the uninitialized zero app_id is not found in the list,
it returns a failure.

Fix to this is look for non-zero valid app_id in the app_list when
releasing the handle.

Change-Id: If0bf918a6397d8d5f925abde895b096dab76a9bb
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>