arm_ffa: Distinguish between uninitialized and failed

Add a new FF-A initialization state to distinguish
between not-yet-initialized (before calling arm_ffa_init)
and failed-to-initialize (after arm_ffa_init).

Bug: 284057071
Change-Id: Ib6c243a6490c6a35337b4c9fb53eeb36e769565c
2 files changed