refactor(ff-a): init

Move `plat_ffa_init` and `plat_ffa_log_init` to new `init.c` file.

Change-Id: I65484c6d5cd868de01c5bb8fb3edd103a0d61262
Signed-off-by: Karl Meakin <karl.meakin@arm.com>
diff --git a/inc/hf/ffa/init.h b/inc/hf/ffa/init.h
new file mode 100644
index 0000000..5fef405
--- /dev/null
+++ b/inc/hf/ffa/init.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright 2025 The Hafnium Authors.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/BSD-3-Clause.
+ */
+
+#pragma once
+
+#include "hf/mpool.h"
+
+void plat_ffa_log_init(void);
+void plat_ffa_init(struct mpool *ppool);
+
+bool plat_ffa_is_tee_enabled(void);
+void plat_ffa_set_tee_enabled(bool tee_enabled);