ath79-generic: remove Ubiquiti AirMax targets (#3067)

Remove due to ticket #2939

These devices risk being bricked in a way that can not be recovered
without running full TFTP or serial recovery, as the flash ends up in a
read-only state with no way of upgrading to a fixed version.

Thus, remove the support for the time being. Don't just flag them as
BROKEN, as this would deliberately brick these boards when installating
such an image.

Signed-off-by: David Bauer <mail@david-bauer.net>

docs/user/supported_devices.rst

@@ -128,10 +128,6 @@ ath79-generic
 
 * Ubiquiti
 
-  - NanoBeam 5AC 19 (XC)
-  - NanoBeam M5 (XW)
-  - NanoStation Loco M2/M5 (XW)
-  - NanoStation M2/M5 (XW)
   - UniFi AC Lite
   - UniFi AC LR
   - UniFi AC Mesh

targets/ath79-generic

@@ -541,21 +541,6 @@ device('tp-link-wbs510-v1', 'tplink_wbs510-v1', {
 
 -- Ubiquiti
 
-device('ubiquiti-nanostation-loco-m-xw', 'ubnt_nanostation-loco-m-xw', {
-	manifest_aliases = {
-		'ubiquiti-loco-m-xw', -- upgrade from OpenWrt 19.07
-		'ubiquiti-nanostation-loco-m2-xw', -- upgrade from OpenWrt 19.07
-		'ubiquiti-nanostation-loco-m5-xw', -- upgrade from OpenWrt 19.07
-	},
-})
-
-device('ubiquiti-nanostation-m-xw', 'ubnt_nanostation-m-xw', {
-	manifest_aliases = {
-		'ubiquiti-nanostation-m2-xw', -- upgrade from OpenWrt 19.07
-		'ubiquiti-nanostation-m5-xw', -- upgrade from OpenWrt 19.07
-	},
-})
-
 device('ubiquiti-unifi-ac-lite', 'ubnt_unifiac-lite', {
 	factory = false,
 	packages = ATH10K_PACKAGES_QCA9880,
@@ -590,12 +575,6 @@ device('ubiquiti-unifi-ap', 'ubnt_unifi-ap', {
 	},
 })
 
-device('ubiquiti-nanobeam-ac-gen1-xc', 'ubnt_nanobeam-ac-xc', {
-	packages = ATH10K_PACKAGES_QCA9880,
-})
-
-device('ubiquiti-nanobeam-m5-xw', 'ubnt_nanobeam-m5-xw')
-
 device('ubiquiti-unifi-ap-outdoor+', 'ubnt_unifi-ap-outdoor-plus', {
 	manifest_aliases = {
 		'ubiquiti-unifiap-outdoor+', -- upgrade from OpenWrt 19.07