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-arm/asm/dma.h b/libc/kernel/arch-arm/asm/dma.h
index f23c8fe..7eeeb78 100644
--- a/libc/kernel/arch-arm/asm/dma.h
+++ b/libc/kernel/arch-arm/asm/dma.h
@@ -7,40 +7,39 @@
  ***   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_ARM_DMA_H
 #define __ASM_ARM_DMA_H
+
 typedef unsigned int dmach_t;
+
 #include <linux/spinlock.h>
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/system.h>
 #include <asm/scatterlist.h>
 #include <asm/arch/dma.h>
+
 #ifndef MAX_DMA_ADDRESS
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MAX_DMA_ADDRESS 0xffffffff
 #endif
+
 typedef unsigned int dmamode_t;
+
 #define DMA_MODE_MASK 3
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define DMA_MODE_READ 0
 #define DMA_MODE_WRITE 1
 #define DMA_MODE_CASCADE 2
 #define DMA_AUTOINIT 4
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+
 #define clear_dma_ff(channel)
+
 #define set_dma_addr(channel, addr)   __set_dma_addr(channel, bus_to_virt(addr))
+
 #ifndef NO_DMA
 #define NO_DMA 255
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
+
 #define isa_dma_bridge_buggy (0)
+
 #endif