Update bionic kernel headers using update_all.py

Change-Id: I9c377436e9bf158e7236b3b7dcebf3e79fa961de
diff --git a/libc/kernel/common/linux/kdev_t.h b/libc/kernel/common/linux/kdev_t.h
index 517f9c3..1010b09 100644
--- a/libc/kernel/common/linux/kdev_t.h
+++ b/libc/kernel/common/linux/kdev_t.h
@@ -7,12 +7,19 @@
  ***   structures, and macros generated from the original header, and thus,
  ***   contains no copyrightable information.
  ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
  ****************************************************************************
  ****************************************************************************/
 #ifndef _LINUX_KDEV_T_H
 #define _LINUX_KDEV_T_H
-
 #define MAJOR(dev) ((dev)>>8)
 #define MINOR(dev) ((dev) & 0xff)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MKDEV(ma,mi) ((ma)<<8 | (mi))
 #endif