ath79-generic: add WNR2200-16M

The CN/RU variant of the device has the same hardware
as the EU already supported, but contains a 16M flash chip.

docs/user/supported_devices.rst

@@ -51,7 +51,7 @@ ath79-generic
 * Netgear
 
   - WNDR3700 (v1, v2)
-  - WNR2200 (8M)
+  - WNR2200 (8M, 16M)
 
 * OCEDO
 

targets/ath79-generic

@@ -156,6 +156,10 @@ device('netgear-wnr2200-8m', 'netgear_wnr2200-8m', {
 	factory_ext = '.img',
 })
 
+device('netgear-wnr2200-16m', 'netgear_wnr2200-16m', {
+	factory_ext = '.img',
+})
+
 
 -- OCEDO