Au1200: IDE driver build fix

The driver fails to compile with CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA enabled:

drivers/ide/mips/au1xxx-ide.c: In function `auide_build_dmatable':
drivers/ide/mips/au1xxx-ide.c:256: error: implicit declaration of function
`sg_virt'
drivers/ide/mips/au1xxx-ide.c:275: error: implicit declaration of function
`sg_next'
drivers/ide/mips/au1xxx-ide.c:275: warning: assignment makes pointer from
integer without a cast

Fix this by including <linux/scatterlist.h>. While at it, remove the #include's
without which the driver happily builds.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/mips/au1xxx-ide.c

@@ -32,19 +32,12 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
-
 #include <linux/init.h>
 #include <linux/ide.h>
-#include <linux/sysdev.h>
-
-#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
 
-#include "ide-timing.h"
-
-#include <asm/io.h>
 #include <asm/mach-au1x00/au1xxx.h>
 #include <asm/mach-au1x00/au1xxx_dbdma.h>
-
 #include <asm/mach-au1x00/au1xxx_ide.h>
 
 #define DRV_NAME	"au1200-ide"