test(spm): add test for Ivy with no shim

Add TFTF build config to build the Ivy sp with no shim. This also
requires using the hafnium build for VHE so add a hook to set
the spm build directory to secure_aem_v8a_fvp_vhe_clang for this
config.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: I7b5d0ee2b4bd44c7fad1af161c729506e152a207
3 files changed