wireless: Use eth_<foo>_addr instead of memset

Use the built-in function instead of memset.

Miscellanea:

Add #include <linux/etherdevice.h> where appropriate
Use ETH_ALEN instead of 6

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index d6d2f0f..6c364bb 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -1182,7 +1182,7 @@
 		if (is_zero_ether_addr(arvif->bssid))
 			return;
 
-		memset(arvif->bssid, 0, ETH_ALEN);
+		eth_zero_addr(arvif->bssid);
 
 		return;
 	}