crypto: cryptd - Add missing aead.h inclusion

cryptd.h needs to include crypto/aead.h because it uses crypto_aead.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/cryptd.h b/include/crypto/cryptd.h
index ba98918..1547f54 100644
--- a/include/crypto/cryptd.h
+++ b/include/crypto/cryptd.h
@@ -14,6 +14,7 @@
 
 #include <linux/crypto.h>
 #include <linux/kernel.h>
+#include <crypto/aead.h>
 #include <crypto/hash.h>
 
 struct cryptd_ablkcipher {