[U-Boot] [PATCH v2 30/31] binman: Add an 'extract' command

[sjg at google.com]

It is useful to be able to extract all binaries from the image, or a
subset of them. Add a new 'extract' command to handle this.

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

Changes in v2: None

 tools/binman/README     |  25 +++++-
 tools/binman/cmdline.py |  13 +++
 tools/binman/control.py |  60 +++++++++++++
 tools/binman/ftest.py   | 189 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 286 insertions(+), 1 deletion(-)

Applied to u-boot-dm, thanks!