Staging: remove duplicated #include's

Removed duplicated #include's in
  drivers/staging/altpciechdma/altpciechdma.c
  drivers/staging/comedi/comedidev.h
  drivers/staging/rt2860/rt_linux.h
  drivers/staging/rt2870/rt_linux.h

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/altpciechdma/altpciechdma.c

@@ -46,7 +46,6 @@
 #include <linux/cdev.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
-#include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>

drivers/staging/comedi/comedidev.h

@@ -36,7 +36,6 @@
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/vmalloc.h>
-#include <linux/mm.h>
 #include "interrupt.h"
 #include <linux/dma-mapping.h>
 #include <linux/uaccess.h>

drivers/staging/rt2860/rt_linux.h

@@ -65,7 +65,6 @@
 #include <linux/vmalloc.h>
 
 
-#include <linux/wireless.h>
 #include <net/iw_handler.h>
 
 // load firmware

drivers/staging/rt2870/rt_linux.h

@@ -65,7 +65,6 @@
 #include <linux/vmalloc.h>
 
 
-#include <linux/wireless.h>
 #include <net/iw_handler.h>
 
 // load firmware