qseecom: fix secure app loading failure by kernel mode qseecom client

Make a change to fix secure app loading failure due to premature
kzfree() from __qseecom_load_fw(), when kernel mode qseecom client
tries to load app.

CRs-fixed: 694541

Change-Id: I1ac39ee885c12e08e863d976321dda2380ace852
Signed-off-by: William Clark <wclark@codeaurora.org>