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/asm-generic/signal.h b/libc/kernel/common/asm-generic/signal.h
index f106b38..226d99c 100644
--- a/libc/kernel/common/asm-generic/signal.h
+++ b/libc/kernel/common/asm-generic/signal.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 __ASM_GENERIC_SIGNAL_H
 #define __ASM_GENERIC_SIGNAL_H
+
 #include <linux/compiler.h>
+
 #ifndef SIG_BLOCK
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIG_BLOCK 0  
 #endif
 #ifndef SIG_UNBLOCK
 #define SIG_UNBLOCK 1  
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #ifndef SIG_SETMASK
 #define SIG_SETMASK 2  
 #endif
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #ifndef __ASSEMBLY__
 typedef void __signalfn_t(int);
 typedef __signalfn_t __user *__sighandler_t;
+
 typedef void __restorefn_t(void);
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 typedef __restorefn_t __user *__sigrestore_t;
+
 #define SIG_DFL ((__force __sighandler_t)0)  
 #define SIG_IGN ((__force __sighandler_t)1)  
 #define SIG_ERR ((__force __sighandler_t)-1)  
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
+
 #endif