Revert "Update bionic kernel headers using update_all.py"

This reverts commit 94a85f663694e1869acb1c2e8a3c374a6fa3ab86

There is a smoke test failure for Prime but Crespo/Stingray are fine. Will revert the change for now until further investigation is made.
diff --git a/libc/kernel/common/linux/atmppp.h b/libc/kernel/common/linux/atmppp.h
index 98e2e31..3330c32 100644
--- a/libc/kernel/common/linux/atmppp.h
+++ b/libc/kernel/common/linux/atmppp.h
@@ -7,25 +7,20 @@
  ***   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_ATMPPP_H
 #define _LINUX_ATMPPP_H
+
 #include <linux/atm.h>
+
 #define PPPOATM_ENCAPS_AUTODETECT (0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPPOATM_ENCAPS_VC (1)
 #define PPPOATM_ENCAPS_LLC (2)
+
 struct atm_backend_ppp {
  atm_backend_t backend_num;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int encaps;
 };
+
 #endif