ar71xx-generic: drop ALFA N2, N5, Tube2H and Hornet-UB

Their kernel partition is too small, the OpenWrt build system
is unable to create an image.

docs/user/supported_devices.rst

@@ -13,10 +13,6 @@ ar71xx-generic
   - AP121 [#deprecated]_
   - AP121F
   - AP121U [#deprecated]_
-  - Hornet-UB [#deprecated]_
-  - Tube2H [#deprecated]_
-  - N2 [#deprecated]_
-  - N5 [#deprecated]_
 
 * Allnet
 

targets/ar71xx-generic

@@ -24,21 +24,6 @@ device('alfa-network-ap121f', 'ap121f', {
 	factory = false,
 })
 
-device('alfa-network-hornet-ub', 'hornet-ub', {
-	profile = 'HORNETUB',
-	aliases = { 'alfa-network-ap121', 'alfa-network-ap121u' },
-	deprecated = true,  -- kernel partition too small with OpenWrt 19.07
-})
-
-device('alfa-network-tube2h', 'tube2h-8M', {
-	profile = 'TUBE2H8M',
-	deprecated = true,  -- kernel partition too small with OpenWrt 19.07
-})
-device('alfa-network-n2-n5', 'alfa-nx', {
-	profile = 'ALFANX',
-	deprecated = true,  -- kernel partition too small with OpenWrt 19.07
-})
-
 
 -- Allnet