tools: MediaTek: add MTK boot header generation to mkimage

This patch adds support for MTK boot image generation.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
7 files changed