crypto: speck - add test vectors for Speck128-XTS

Add test vectors for Speck128-XTS, generated in userspace using C code.
The inputs were borrowed from the AES-XTS test vectors.

Both xts(speck128-generic) and xts-speck128-neon pass these tests.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 058ed5e..e011a34 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -3576,6 +3576,15 @@ static const struct alg_test_desc alg_test_descs[] = {
 			}
 		}
 	}, {
+		.alg = "xts(speck128)",
+		.test = alg_test_skcipher,
+		.suite = {
+			.cipher = {
+				.enc = __VECS(speck128_xts_enc_tv_template),
+				.dec = __VECS(speck128_xts_dec_tv_template)
+			}
+		}
+	}, {
 		.alg = "xts(twofish)",
 		.test = alg_test_skcipher,
 		.suite = {