[U-Boot] [PATCH 02/11] dtoc: Add a comment at the top

[sjg at google.com]

Add a description of the dtoc tool at the top of the file.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 tools/dtoc/dtoc.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

Applied to u-boot-dm, thanks!