ramips: mt7621: reenable rbm11g

I have a rbm11g and can confirm that the LAN port is indeed
switch port 0.

Signed-off-by: Tobias Schramm <[email protected]>

target/linux/ramips/dts/mt7621_mikrotik_rbm11g.dts

@@ -145,7 +145,6 @@
 
 &switch0 {
 	ports {
-		/* FIXME: Is LAN port at switch port 0? */
 		port@0 {
 			status = "okay";
 			label = "lan";

target/linux/ramips/image/mt7621.mk

@@ -506,7 +506,6 @@ TARGET_DEVICES += mikrotik_rb750gr3
 define Device/mikrotik_rbm11g
   $(Device/MikroTik)
   DEVICE_MODEL := RouterBOARD M11G
-  DEFAULT := n # disabled due to unknown port assignment
 endef
 TARGET_DEVICES += mikrotik_rbm11g