binman: Add support for externally encrypted blobs

This adds a new etype encrypted.

It creates a new cipher node in the related image similar to the
cipher node used by u-boot, see boot/image-cipher.c.

Signed-off-by: Christian Taedcke <christian.taedcke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2 files changed