all: remove use of struct ether_addr / ether_aton()

Lots of old code used struct ether_addr to store hardware addresses,
and ether_aton() to parse them, but more recent code generally uses
guint8 arrays, and the nm_utils_hwaddr_* methods, to be able to share
code between ETH_ALEN and INFINIBAND_ALEN cases. So update the old
code to match the new. (In many places, this ends up getting rid of
casts between struct ether_addr and guint8* anyway.)

(Also, in some places, variables were switched from struct ether_addr
to guint8[] a while back, but some code still used "&" when referring
to them even though that's unnecessary now. Clean that up.)

src/platform/nm-linux-platform.c

@@ -3163,7 +3163,7 @@ wifi_get_capabilities (NMPlatform *platform, int ifindex, NMDeviceWifiCapabiliti
 }
 
 static gboolean
-wifi_get_bssid (NMPlatform *platform, int ifindex, struct ether_addr *bssid)
+wifi_get_bssid (NMPlatform *platform, int ifindex, guint8 *bssid)
 {
 	WifiData *wifi_data = wifi_get_wifi_data (platform, ifindex);