crypto: prefix module autoloading with "crypto-"

This prefixes all crypto module loading with "crypto-" so we never run
the risk of exposing module auto-loading to userspace via a crypto API,
as demonstrated by Mathias Krause:

https://lkml.org/lkml/2013/3/4/70

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/aes_generic.c b/crypto/aes_generic.c
index fd0d6b4..9b3c54c 100644
--- a/crypto/aes_generic.c
+++ b/crypto/aes_generic.c
@@ -1474,4 +1474,4 @@
 
 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
 MODULE_LICENSE("Dual BSD/GPL");
-MODULE_ALIAS("aes");
+MODULE_ALIAS_CRYPTO("aes");