image: Combine image_sig_algo with image_sign_info

Remove the need to explicitly add SHA/RSA pairings. Invalid SHA/RSA
pairings will still fail on verify operations when the hash length is
longer than the key length.

Follow the same naming scheme "checksum,crytpo" without explicitly
defining the string.

Indirectly adds support for "sha1,rsa4096" signing/verification.

Signed-off-by: Andrew Duda <aduda@meraki.com>
Signed-off-by: aduda <aduda@meraki.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/rsa/rsa-sign.c b/lib/rsa/rsa-sign.c
index c26f741..9a09280 100644
--- a/lib/rsa/rsa-sign.c
+++ b/lib/rsa/rsa-sign.c
@@ -244,7 +244,7 @@
 	ret = rsa_get_priv_key(info->keydir, info->keyname, &rsa);
 	if (ret)
 		goto err_priv;
-	ret = rsa_sign_with_key(rsa, info->algo->checksum, region,
+	ret = rsa_sign_with_key(rsa, info->checksum, region,
 				region_count, sigp, sig_len);
 	if (ret)
 		goto err_sign;
@@ -508,7 +508,7 @@
 	}
 	if (!ret) {
 		ret = fdt_setprop_string(keydest, node, FIT_ALGO_PROP,
-					 info->algo->name);
+					 info->name);
 	}
 	if (!ret && info->require_keys) {
 		ret = fdt_setprop_string(keydest, node, "required",