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-arm/asm/poll.h b/libc/kernel/arch-arm/asm/poll.h
index 4c0f364..c5b80a5 100644
--- a/libc/kernel/arch-arm/asm/poll.h
+++ b/libc/kernel/arch-arm/asm/poll.h
@@ -7,38 +7,30 @@
  ***   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 __ASMARM_POLL_H
 #define __ASMARM_POLL_H
+
 #define POLLIN 0x0001
 #define POLLPRI 0x0002
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define POLLOUT 0x0004
 #define POLLERR 0x0008
 #define POLLHUP 0x0010
 #define POLLNVAL 0x0020
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define POLLRDNORM 0x0040
 #define POLLRDBAND 0x0080
 #define POLLWRNORM 0x0100
 #define POLLWRBAND 0x0200
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define POLLMSG 0x0400
 #define POLLREMOVE 0x1000
 #define POLLRDHUP 0x2000
+
 struct pollfd {
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int fd;
  short events;
  short revents;
 };
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #endif