qseecom: Check for invalid registration of secapp region

Check the validity of response result field returned by QSEE
when issuing a request to register the secure app region
information.

Change-Id: Idc5ee7cf3c0a25ca37f23ef9d1718fdb05af6533
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>