Bring these files into the documentation.
Fix 'wtih' and 'it' typos and repeated 'could' while we are here.
Signed-off-by: Simon Glass <sjg@chromium.org>
Add a description of how to implement verified boot using signed FIT images,
and a simple test which verifies operation on sandbox.
The test signs a FIT image and verifies it, then signs a FIT configuration
and verifies it. Then it corrupts the signature to check that this is
detected.
Signed-off-by: Simon Glass <sjg@chromium.org>
