crypto: atmel - Remove possible typo error

Commit bd3c7b5c2a ("crypto: atmel - add Atmel AES driver") possibly
has a typo error of adding an extra CONFIG_.

CC: Nicolas Royer <nicolas@eukrea.com>
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/Kconfig

@@ -334,7 +334,7 @@ config CRYPTO_DEV_ATMEL_AES
 	select CRYPTO_AES
 	select CRYPTO_ALGAPI
 	select CRYPTO_BLKCIPHER
-	select CONFIG_AT_HDMAC
+	select AT_HDMAC
 	help
 	  Some Atmel processors have AES hw accelerator.
 	  Select this if you want to use the Atmel module for