binman: Add a bintool implementation for mkimage

Add a Bintool for this, which is used to build images for use by U-Boot.
It supports the features needed by binman as well as installing via the
u-boot-tools packages. Although this is built in the U-Boot tree, it is
still useful to install a binary on the system.

Signed-off-by: Simon Glass <sjg@chromium.org>
1 file changed