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/percpu.h b/libc/kernel/common/linux/percpu.h
index 9597e29..c195616 100644
--- a/libc/kernel/common/linux/percpu.h
+++ b/libc/kernel/common/linux/percpu.h
@@ -7,30 +7,24 @@
  ***   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_PERCPU_H
 #define __LINUX_PERCPU_H
 #include <linux/spinlock.h>  
 #include <linux/slab.h>  
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/smp.h>
 #include <linux/string.h>  
 #include <asm/percpu.h>
+
 #ifndef PERCPU_ENOUGH_ROOM
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PERCPU_ENOUGH_ROOM 32768
 #endif
+
 #define get_cpu_var(var) (*({ preempt_disable(); &__get_cpu_var(var); }))
 #define put_cpu_var(var) preempt_enable()
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
+
 #define alloc_percpu(type) ((type *)(__alloc_percpu(sizeof(type))))
 #endif