ath79-generic: (re)add support for UniFi AP

Gone due to
commit 45c84a11 ("ar71xx: drop target")

docs/user/supported_devices.rst

@@ -54,6 +54,10 @@ ath79-generic
   - TL-WDR4300 (v1)
   - WBS210 (v2.0)
 
+* Ubiquiti
+
+  - UniFi AP
+
 ath79-nand
 ----------
 

targets/ath79-generic

@@ -135,3 +135,11 @@ device('tp-link-tl-wdr3600-v1', 'tplink_tl-wdr3600-v1')
 device('tp-link-tl-wdr4300-v1', 'tplink_tl-wdr4300-v1')
 
 device('tp-link-wbs210-v2', 'tplink_wbs210-v2')
+
+-- Ubiquiti
+
+device('ubiquiti-unifi-ap', 'ubnt_unifi', {
+	manifest_aliases = {
+		'ubiquiti-unifi',
+	},
+})