Test: Use macro for secure partition stack size

TF-M adds a new SECURE_TEST_PARTITION_STACK_SIZE macro which specifies
the size of the secure test partition stack. Make use of it in the
manifest file.

Change-Id: I6126a69955f741e44b34fbd000375196bfb1f982
Signed-off-by: Jackson Cooper-Driver <jackson.cooper-driver@arm.com>
1 file changed