test: deny prohibited ABIs while handling CPU_OFF psci msg

FF-A spec states that SPs are prohibited from invoking Direct request,
FFA_RUN and FFA_YIELD interfaces while handling power management
framework message. Make the Cactus SP intentionally invoke prohibited
interfaces and attest that SPMC should deny such invocations.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I0a823bf950e3895cb4aff7320c6a0ef7fdec634b
3 files changed