ramips-mt7621: add back Edgerouter X" (#3533)

These devices are usable again, as the flash has been repartitioned
to accommodate the increased kernel size.

This reverts commit 224d0aa7.

docs/user/supported_devices.rst

@@ -485,6 +485,8 @@ ramips-mt7621
 
 * Ubiquiti
 
+  - EdgeRouter X
+  - EdgeRouter X-SFP
   - UniFi 6 Lite
   - UniFi nanoHD
 

targets/ramips-mt7621

@@ -183,3 +183,17 @@ device('zyxel-wsm20', 'zyxel_wsm20', {
 	factory = false,
 })
 
+
+-- Devices without WLAN
+
+-- Ubiquiti
+
+device('ubiquiti-edgerouter-x', 'ubnt_edgerouter-x', {
+	factory = false,
+	packages = {'-hostapd-mini'},
+})
+
+device('ubiquiti-edgerouter-x-sfp', 'ubnt_edgerouter-x-sfp', {
+	factory = false,
+	packages = {'-hostapd-mini'},
+})