ath79-generic: add support for Onion Omega

support was previously dropped in
commit 45c84a117b ("ar71xx: drop target")

docs/user/supported_devices.rst

@@ -25,6 +25,10 @@ ath79-generic
 
   - Raccoon
 
+* Onion
+
+  - Omega
+
 * Plasma Cloud
 
   - PA300

targets/ath79-generic

@@ -74,6 +74,10 @@ device('ocedo-raccoon', 'ocedo_raccoon', {
 	factory = false,
 })
 
+-- Onion
+
+device('onion-omega', 'onion_omega')
+
 -- Plasma Cloud
 
 device('plasma-cloud-pa300', 'plasmacloud_pa300')