feat(qemu): implement firmware handoff on qemu

Implement firmware handoff from BL2 to BL33 on qemu platform
compliant to Firmware handoff specification v0.9.

Change-Id: Id8d5206a71ef6ec97cf3c97995de328ebf0600cc
Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
diff --git a/plat/qemu/common/qemu_private.h b/plat/qemu/common/qemu_private.h
index e80a88d..c8912b2 100644
--- a/plat/qemu/common/qemu_private.h
+++ b/plat/qemu/common/qemu_private.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2023, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -40,4 +40,6 @@
 			size_t log_size,
 			uintptr_t *ns_log_addr);
 
+void qemu_bl2_sync_transfer_list(void);
+
 #endif /* QEMU_PRIVATE_H */