mac80211: rt2x00: add missing of.h header

Signed-off-by: Felix Kaechele <heffer@fedoraproject.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37618 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/kernel/mac80211/patches/619-rt2x00-change-led-polarity-from-OF.patch

 --- a/drivers/net/wireless/rt2x00/rt2800lib.c
 +++ b/drivers/net/wireless/rt2x00/rt2800lib.c
-@@ -5965,6 +5965,13 @@ static int rt2800_init_eeprom(struct rt2
+@@ -39,6 +39,7 @@
+ #include <linux/module.h>
+ #include <linux/slab.h>
+ #include <linux/clk.h>
++#include <linux/of.h>
+ 
+ #include "rt2x00.h"
+ #include "rt2800lib.h"
+@@ -5966,6 +5967,13 @@ static int rt2800_init_eeprom(struct rt2
  	rt2800_init_led(rt2x00dev, &rt2x00dev->led_assoc, LED_TYPE_ASSOC);
  	rt2800_init_led(rt2x00dev, &rt2x00dev->led_qual, LED_TYPE_QUALITY);