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/asm-generic/percpu.h b/libc/kernel/common/asm-generic/percpu.h
index 55b8b6a..e498300 100644
--- a/libc/kernel/common/asm-generic/percpu.h
+++ b/libc/kernel/common/asm-generic/percpu.h
@@ -7,27 +7,23 @@
  ***   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 _ASM_GENERIC_PERCPU_H_
 #define _ASM_GENERIC_PERCPU_H_
 #include <linux/compiler.h>
+
 #define __GENERIC_PER_CPU
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define DEFINE_PER_CPU(type, name)   __typeof__(type) per_cpu__##name
+
 #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
 #define __get_cpu_var(var) per_cpu__##var
 #define __raw_get_cpu_var(var) per_cpu__##var
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
+
 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+
 #endif
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */