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-x86/asm/cacheflush.h b/libc/kernel/arch-x86/asm/cacheflush.h
index 92a6458..028277b 100644
--- a/libc/kernel/arch-x86/asm/cacheflush.h
+++ b/libc/kernel/arch-x86/asm/cacheflush.h
@@ -7,35 +7,28 @@
  ***   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_X86_CACHEFLUSH_H
 #define _ASM_X86_CACHEFLUSH_H
+
 #include <linux/mm.h>
+
 #define flush_cache_all() do { } while (0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define flush_cache_mm(mm) do { } while (0)
 #define flush_cache_dup_mm(mm) do { } while (0)
 #define flush_cache_range(vma, start, end) do { } while (0)
 #define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define flush_dcache_page(page) do { } while (0)
 #define flush_dcache_mmap_lock(mapping) do { } while (0)
 #define flush_dcache_mmap_unlock(mapping) do { } while (0)
 #define flush_icache_range(start, end) do { } while (0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define flush_icache_page(vma,pg) do { } while (0)
 #define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
 #define flush_cache_vmap(start, end) do { } while (0)
 #define flush_cache_vunmap(start, end) do { } while (0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define copy_to_user_page(vma, page, vaddr, dst, src, len)   memcpy(dst, src, len)
 #define copy_from_user_page(vma, page, vaddr, dst, src, len)   memcpy(dst, src, len)
+
 #endif