qseecom: Change whitelist_support flag to false if TZ failed to check

The whitelist status is set default as true though TZ failed to check,
which in turn causing the send_command fail by passing whitelist commnd id.
So updating the support status flag to false when TZ fails to check.

Change-Id: I78a7600506b4d2457bb1c38f8a39888a9cf9467c
Signed-off-by: Mallikarjuna Reddy Amireddy <mamire@codeaurora.org>
Signed-off-by: Zhen Kong <zkong@codeaurora.org>