pxa168_eth: remove duplicated #include

Remove duplicated #include('s) in
  drivers/net/pxa168_eth.c
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/pxa168_eth.c

@@ -42,8 +42,6 @@
 #include <linux/types.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
-#include <linux/delay.h>
-#include <linux/dma-mapping.h>
 #include <asm/cacheflush.h>
 #include <linux/pxa168_eth.h>