lib: sm: FF-A messages now carry Trusty SM calls

If FFA_MSG_WAIT is supported, then Trusty API calls
are encapsulated within FF-A direct messages.

Bug: 284057071
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Change-Id: I7abee0c070f4d45ed7518691c0f0c332ce5e813f
4 files changed