wireless: update gfp/slab.h includes

Implicit slab.h inclusion via percpu.h is about to go away.  Make sure
gfp.h or slab.h is included as necessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/htc.h

@@ -23,6 +23,7 @@
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/leds.h>
+#include <linux/slab.h>
 #include <net/mac80211.h>
 
 #include "common.h"

drivers/net/wireless/iwlwifi/iwl-agn-ict.c

@@ -30,6 +30,7 @@
 #include <linux/module.h>
 #include <linux/etherdevice.h>
 #include <linux/sched.h>
+#include <linux/gfp.h>
 #include <net/mac80211.h>
 
 #include "iwl-dev.h"