qseecom: improve blocked listener processing for smcinvoke

When processing blocked listener command for smcinvoke,
__qseecom_process_reentrancy_blocked_on_listener() actually
get a dummy app, which should be ignored.

Change-Id: I54c87218357b7bfc60b8da808c38e6efe9ad64f0
Signed-off-by: Zhen Kong <zkong@codeaurora.org>