[CRYPTO] padlock: Add compatibility alias after rename

Whenever we rename modules we should add an alias to ensure that existing
users can still locate the new module.

This patch also gets rid of the now unused module function prototypes from
padlock.h.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/padlock-aes.c

@@ -533,3 +533,6 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Michal Ludvig");
 
 MODULE_ALIAS("aes-padlock");
+
+/* This module used to be called padlock. */
+MODULE_ALIAS("padlock");