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/arch-x86/asm/system_32.h b/libc/kernel/arch-x86/asm/system_32.h
index ec01cc6..d799ae6 100644
--- a/libc/kernel/arch-x86/asm/system_32.h
+++ b/libc/kernel/arch-x86/asm/system_32.h
@@ -7,35 +7,27 @@
  ***   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_SYSTEM_H
 #define __ASM_SYSTEM_H
+
 #include <linux/kernel.h>
 #include <asm/segment.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/cpufeature.h>
 #include <asm/cmpxchg.h>
+
 #define nop() __asm__ __volatile__ ("nop")
 #define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
 #define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
 #define read_barrier_depends() do { } while(0)
 #define smp_mb() barrier()
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define smp_rmb() barrier()
 #define smp_wmb() barrier()
 #define smp_read_barrier_depends() do { } while(0)
 #define set_mb(var, value) do { var = value; barrier(); } while (0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/irqflags.h>
 #define HAVE_DISABLE_HLT
+
 #endif