feat(notifications): functions to get framework notifications

Extend the vm module with functions to get framework notifications for a
given partition.
This is to be used in the indirect messaging implementation, to get
the RX buffer full notification when partitions receive a message.

Change-Id: I547fd54c9575e4c0120f6cb18973071e201355fd
Signed-off-by: J-Alves <joao.alves@arm.com>
diff --git a/src/api.c b/src/api.c
index 594c9e8..72043d8 100644
--- a/src/api.c
+++ b/src/api.c
@@ -3079,7 +3079,7 @@
 					  ffa_vcpu_index_t vcpu_id,
 					  uint32_t flags, struct vcpu *current)
 {
-	/* TODO: get framework notifications, when these are supported. */
+	ffa_notifications_bitmap_t framework_notifications = 0;
 	ffa_notifications_bitmap_t sp_notifications = 0;
 	ffa_notifications_bitmap_t vm_notifications = 0;
 	struct vm_locked receiver_locked;
@@ -3146,8 +3146,8 @@
 			receiver_locked, true, vcpu_id);
 	}
 
-	ret = api_ffa_notification_get_success_return(sp_notifications,
-						      vm_notifications, 0);
+	ret = api_ffa_notification_get_success_return(
+		sp_notifications, vm_notifications, framework_notifications);
 
 	/*
 	 * If there are no more pending notifications, change `sri_state` to