refactor: rename type for FF-A IDs

The FF-A ID is a unsigned 16-bit value that was named
ffa_vm_id_t. This patch changes it to simply ffa_id_t.
This is to make clearer the ID type is used for other
endpoints other than simply VMs.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I60319c08481b2380bd0063b108a35fc01e2af537
diff --git a/inc/hf/ffa_memory.h b/inc/hf/ffa_memory.h
index a8519a1..8187e6f 100644
--- a/inc/hf/ffa_memory.h
+++ b/inc/hf/ffa_memory.h
@@ -30,7 +30,7 @@
 struct ffa_value ffa_memory_retrieve_continue(struct vm_locked to_locked,
 					      ffa_memory_handle_t handle,
 					      uint32_t fragment_offset,
-					      ffa_vm_id_t sender_vm_id,
+					      ffa_id_t sender_vm_id,
 					      struct mpool *page_pool);
 struct ffa_value ffa_memory_relinquish(
 	struct vm_locked from_locked,