lib/rsa: Use the 'keyfile' argument from mkimage
Keys can be derived from keydir, and the "key-name-hint" property of the FIT. They can also be specified ad-literam via 'keyfile'. Update the RSA signing path to use the appropriate one. Signed-off-by:Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by:
Simon Glass <sjg@chromium.org>
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