feat(spmd): allow forwarding of FFA_FRAG_RX/TX calls

Enable the SPMD to forward FFA_FRAG_RX/TX calls between
the normal world and the SPMC.

Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Change-Id: I097a48552827a8527dd3efe1155bc601d7cbf887
2 files changed