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/blockgroup_lock.h b/libc/kernel/common/linux/blockgroup_lock.h
index f68edbb..c814020 100644
--- a/libc/kernel/common/linux/blockgroup_lock.h
+++ b/libc/kernel/common/linux/blockgroup_lock.h
@@ -7,28 +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 _LINUX_BLOCKGROUP_LOCK_H
 #define _LINUX_BLOCKGROUP_LOCK_H
+
 #include <linux/spinlock.h>
 #include <linux/cache.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define NR_BG_LOCKS 1
+
 struct bgl_lock {
  spinlock_t lock;
 } ____cacheline_aligned_in_smp;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 struct blockgroup_lock {
  struct bgl_lock locks[NR_BG_LOCKS];
 };
+
 #define sb_bgl_lock(sb, block_group)   (&(sb)->s_blockgroup_lock.locks[(block_group) & (NR_BG_LOCKS-1)].lock)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif