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/dma-mapping_32.h b/libc/kernel/arch-x86/asm/dma-mapping_32.h
index 6b41adf..974a60b 100644
--- a/libc/kernel/arch-x86/asm/dma-mapping_32.h
+++ b/libc/kernel/arch-x86/asm/dma-mapping_32.h
@@ -7,27 +7,22 @@
  ***   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_I386_DMA_MAPPING_H
 #define _ASM_I386_DMA_MAPPING_H
+
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #include <asm/cache.h>
 #include <asm/io.h>
 #include <asm/bug.h>
+
 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+
 #define dma_is_consistent(d, h) (1)
 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
+
 #endif
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */