ARM: tegra: add comment re: autogeneration to pinmux headers

Add a comment block to the top of each generated Tegra pinmux header file
indicating that the file was auto-generated, should not be manually
edited, and with a pointer to the tool and command used to generate it.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/board/nvidia/p2571/pinmux-config-p2571.h b/board/nvidia/p2571/pinmux-config-p2571.h
index ac414f0..d323301 100644
--- a/board/nvidia/p2571/pinmux-config-p2571.h
+++ b/board/nvidia/p2571/pinmux-config-p2571.h
@@ -4,6 +4,14 @@
  * SPDX-License-Identifier: GPL-2.0+
  */
 
+/*
+ * THIS FILE IS AUTO-GENERATED - DO NOT EDIT!
+ *
+ * To generate this file, use the tegra-pinmux-scripts tool available from
+ * https://github.com/NVIDIA/tegra-pinmux-scripts
+ * Run "board-to-uboot.py p2571".
+ */
+
 #ifndef _PINMUX_CONFIG_P2571_H_
 #define _PINMUX_CONFIG_P2571_H_