pan/genxml: s/PAN_PAN_HELPERS_H/PAN_PACK_HELPERS_H/

Fix a typo in the multi-inclusion guard.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32962>

src/panfrost/lib/genxml/pan_pack_helpers.h

@@ -3,8 +3,8 @@
  * SPDX-License-Identifier: MIT
  */
 
-#ifndef PAN_PAN_HELPERS_H
-#define PAN_PAN_HELPERS_H
+#ifndef PAN_PACK_HELPERS_H
+#define PAN_PACK_HELPERS_H
 
 #include <inttypes.h>
 #include <stdio.h>