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/atomic_32.h b/libc/kernel/arch-x86/asm/atomic_32.h
index 355b620..677aac8 100644
--- a/libc/kernel/arch-x86/asm/atomic_32.h
+++ b/libc/kernel/arch-x86/asm/atomic_32.h
@@ -7,39 +7,33 @@
  ***   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 __ARCH_I386_ATOMIC__
 #define __ARCH_I386_ATOMIC__
+
 #include <linux/compiler.h>
 #include <asm/processor.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/cmpxchg.h>
+
 typedef struct { int counter; } atomic_t;
+
 #define ATOMIC_INIT(i) { (i) }
+
 #define atomic_read(v) ((v)->counter)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define atomic_set(v,i) (((v)->counter) = (i))
+
 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
 #define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define atomic_inc_return(v) (atomic_add_return(1,v))
 #define atomic_dec_return(v) (atomic_sub_return(1,v))
 #define atomic_clear_mask(mask, addr)  __asm__ __volatile__(LOCK_PREFIX "andl %0,%1"  : : "r" (~(mask)),"m" (*addr) : "memory")
 #define atomic_set_mask(mask, addr)  __asm__ __volatile__(LOCK_PREFIX "orl %0,%1"  : : "r" (mask),"m" (*(addr)) : "memory")
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define smp_mb__before_atomic_dec() barrier()
 #define smp_mb__after_atomic_dec() barrier()
 #define smp_mb__before_atomic_inc() barrier()
 #define smp_mb__after_atomic_inc() barrier()
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm-generic/atomic.h>
 #endif