test/py: ecdsa: Use mkimage keyfile instead of keydir argument

Originally, the ECDSA code path used 'keydir' as the key filename.
mkimage has since been updated to include a new 'keyfile' argument.
Use the new argument for passing in the key.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed