[PATCH 3/6] binman: Ensure attributes always come last in the metadata

[Simon Glass]

cbfsutil changed to write zero bytes instead of 0xff when a small
padding must be added. Adjust the binman implementation to do the same.

Drop the code which looks for an unused attribute tag, since it is not
used. A future patch moves the attributes to the end of the header in
any case, so no data will follow the attributes.

This mirrors commit f0cc7adb2f in coreboot.

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

 tools/binman/cbfs_util.py | 46 ++++++++++++++++++++-------------------
 1 file changed, 24 insertions(+), 22 deletions(-)

Applied to u-boot-dm, thanks!