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/kernel_stat.h b/libc/kernel/common/linux/kernel_stat.h
index c524e47..f333736 100644
--- a/libc/kernel/common/linux/kernel_stat.h
+++ b/libc/kernel/common/linux/kernel_stat.h
@@ -7,43 +7,36 @@
  ***   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_KERNEL_STAT_H
 #define _LINUX_KERNEL_STAT_H
+
 #include <asm/irq.h>
 #include <linux/smp.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/threads.h>
 #include <linux/percpu.h>
 #include <linux/cpumask.h>
 #include <asm/cputime.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 struct cpu_usage_stat {
  cputime64_t user;
  cputime64_t nice;
  cputime64_t system;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  cputime64_t softirq;
  cputime64_t irq;
  cputime64_t idle;
  cputime64_t iowait;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  cputime64_t steal;
 };
+
 struct kernel_stat {
  struct cpu_usage_stat cpustat;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned int irqs[NR_IRQS];
 };
+
 #define kstat_cpu(cpu) per_cpu(kstat, cpu)
+
 #define kstat_this_cpu __get_cpu_var(kstat)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #endif