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/highmem.h b/libc/kernel/common/linux/highmem.h
index 88435c8..d4a34ca 100644
--- a/libc/kernel/common/linux/highmem.h
+++ b/libc/kernel/common/linux/highmem.h
@@ -7,33 +7,25 @@
  ***   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_HIGHMEM_H
 #define _LINUX_HIGHMEM_H
+
 #include <linux/fs.h>
 #include <linux/mm.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #include <asm/cacheflush.h>
+
 #ifndef ARCH_HAS_FLUSH_ANON_PAGE
 #endif
 #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #define kunmap(page) do { (void) (page); } while (0)
 #define kmap_atomic(page, idx) page_address(page)
 #define kunmap_atomic(addr, idx) do { } while (0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
 #define kmap_atomic_to_page(ptr) virt_to_page(ptr)
 #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
 #endif
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif