brcmfmac: remove duplicated include from dhd_dbg.c

Remove duplicated include.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd_dbg.c

@@ -19,7 +19,6 @@
 #include <linux/netdevice.h>
 #include <linux/ieee80211.h>
 #include <linux/module.h>
-#include <linux/netdevice.h>
 
 #include <defs.h>
 #include <brcmu_wifi.h>