lantiq-xway: add support for NETGEAR DGN3500B

docs/user/supported_devices.rst

@@ -274,6 +274,10 @@ lantiq-xway
   - FRITZ!Box 7330 [#avmflash]_ [#lan_as_wan]_
   - FRITZ!Box 7330 SL [#avmflash]_ [#lan_as_wan]_
 
+* NETGEAR
+
+  - DGN3500B [#lan_as_wan]_
+
 mpc85xx-generic
 ---------------
 

targets/lantiq-xway

@@ -6,3 +6,7 @@ device('avm-fritz-box-7320', 'avm_fritz7320', {
 	factory = false,
 	aliases = {'avm-fritz-box-7330', 'avm-fritz-box-7330-sl'},
 })
+
+device('netgear-dgn3500b', 'netgear_dgn3500b', {
+	factory_ext = '.img',
+})