[PATCH 1/7] binman: Allow providing tools and blob directories

[Simon Glass]

At present it is necessary to symlink files containing external blobs into
the U-Boot tree in order for binman to find them. This is not very
convenient.

Add two new environment/Makefile variables to help with this. Add
documentation as well, fixing a related nit.

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

 Makefile                |  2 ++
 tools/binman/binman.rst | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 1 deletion(-)

Applied to u-boot-dm/next, thanks!