feat(lfa): add initial implementation for LFA_PRIME

This patch introduces the overall handling of the LFA_PRIME call,
including input validation and invocation flow.
While this covers the core implementation, per-component-specific
handling will be developed in a separate patch. The respective
component callbacks are invoked as part of this logic.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Ie13d15d0a060ae5f9704991245d2a65c7d846047
2 files changed