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/threads.h b/libc/kernel/common/linux/threads.h
index 118bbe7..5d85878 100644
--- a/libc/kernel/common/linux/threads.h
+++ b/libc/kernel/common/linux/threads.h
@@ -7,20 +7,17 @@
  ***   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_THREADS_H
 #define _LINUX_THREADS_H
+
 #define NR_CPUS 1
+
 #define MIN_THREADS_LEFT_FOR_ROOT 4
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
+
 #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 :   (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
+
 #endif