feat(spmc): add helper function to obtain hyp structure

We assume that the first descriptor in the normal world
endpoints is reserved for the hypervisor and add a helper
function to enable retrieving this directly.

Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Change-Id: I67c3589994eb820ef420db6ab7e8bd0825d64455
1 file changed