feat(lfa): add initial implementation for LFA_ACTIVATE

This patch introduces the overall handling of the LFA_ACTIVATE 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.

Change-Id: Ie9d4584fc0c0abc9a9faffed62165b4461efed3a
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/include/services/lfa_component_desc.h b/include/services/lfa_component_desc.h
index ca3b15e..5f198bd 100644
--- a/include/services/lfa_component_desc.h
+++ b/include/services/lfa_component_desc.h
@@ -19,6 +19,7 @@
 struct lfa_component_status {
 	uint32_t component_id;
 	lfa_prime_status_t prime_status;
+	bool cpu_rendezvous_required;
 };
 
 typedef int32_t (*component_prime_fn)(struct lfa_component_status *activation);