Fix mem retrieve in SPM test SP

The SPM test SP uses sp_memory_retrieve() incorrectly. The number of
input regions is actually 0, since we're passing an empty "regions"
array. The "regions" array is for getting the output regions from
sp_memory_retrieve(), out_region_count is correctly set to 1.

Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>
Change-Id: Ice00443eea2034cc173e67b5655412e3be3546fd
1 file changed