crypto: lrw - Add dependency on ecb

The lrw template relies on ecb to work.  So we need to declare
a Kconfig dependency as well as a module softdep on it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -425,6 +425,7 @@ config CRYPTO_LRW
 	select CRYPTO_SKCIPHER
 	select CRYPTO_MANAGER
 	select CRYPTO_GF128MUL
+	select CRYPTO_ECB
 	help
 	  LRW: Liskov Rivest Wagner, a tweakable, non malleable, non movable
 	  narrow block cipher mode for dm-crypt.  Use it with cipher

crypto/lrw.c

@@ -428,3 +428,4 @@ module_exit(lrw_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("LRW block cipher mode");
 MODULE_ALIAS_CRYPTO("lrw");
+MODULE_SOFTDEP("pre: ecb");