hash: Use uint8_t in preference to u8

This type is more readily available on the host compiler, so use it instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/hash.h b/include/hash.h
index 5cb4dbf..d8ec4f0 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -139,6 +139,7 @@
  * @len:		Length of data that was hashed
  * @output:		Hash value to display
  */
-void hash_show(struct hash_algo *algo, ulong addr, ulong len, u8 *output);
+void hash_show(struct hash_algo *algo, ulong addr, ulong len,
+	       uint8_t *output);
 #endif /* !USE_HOSTCC */
 #endif