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/xor.h b/libc/kernel/common/asm-generic/xor.h
index 7aaa117..6b1e4e8 100644
--- a/libc/kernel/common/asm-generic/xor.h
+++ b/libc/kernel/common/asm-generic/xor.h
@@ -7,14 +7,8 @@
  ***   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!
- ***
  ****************************************************************************
  ****************************************************************************/
 #include <asm/processor.h>
+
 #define XOR_TRY_TEMPLATES   do {   xor_speed(&xor_block_8regs);   xor_speed(&xor_block_8regs_p);   xor_speed(&xor_block_32regs);   xor_speed(&xor_block_32regs_p);   } while (0)