image: image-sig.c: Remove crypto_algos array

Crytographic algorithms (currently RSA), are stored in linker lists.
The crypto_algos array is unused, so remove it, and any logic
associated with it.

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