docker-ce: set proto for docker bridge device to none

Set proto from `static` to `none`. This makes it clear that this
interface is not handled by the netifd.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

utils/docker-ce/files/dockerd.init

@@ -67,7 +67,7 @@ uciadd() {
 		uci_quiet add network interface
 		uci_quiet rename network.@interface[-1]="${iface}"
 		uci_quiet set network.@interface[-1].ifname="${device}"
-		uci_quiet set network.@interface[-1].proto="static"
+		uci_quiet set network.@interface[-1].proto="none"
 		uci_quiet set network.@interface[-1].auto="0"
 		uci_quiet commit network
 	fi