crypto: rockchip - fix privete/private typo

This fix a simple typo on private word.
Reviewed-by: John Keeping <john@metanate.com>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/rockchip/rk3288_crypto.h

@@ -235,7 +235,7 @@ struct rk_ahash_ctx {
 	struct crypto_ahash		*fallback_tfm;
 };
 
-/* the privete variable of hash for fallback */
+/* the private variable of hash for fallback */
 struct rk_ahash_rctx {
 	struct ahash_request		fallback_req;
 	u32				mode;