scripts: target_config_lib: remove handling for targets without devices

Another leftover from legacy OpenWrt targets, which we don't support
anymore.

scripts/target_config_lib.lua

@@ -151,7 +151,6 @@ lib.include(target)
 
 lib.check_devices()
 
-if #lib.devices > 0 then
 handle_target_pkgs(lib.target_packages)
 
 for _, dev in ipairs(lib.devices) do
@@ -180,20 +179,5 @@ if #lib.devices > 0 then
 		table.concat(device_pkgs, ' ')
 	)
 end
-else
-	-- x86 fallback: no devices
-	local target_pkgs = {}
-	local function handle_pkgs(pkgs)
-		target_pkgs = concat_list(target_pkgs, pkgs)
-	end
-
-	-- Just hardcode the class for device-less targets to 'standard'
-	-- - this is x86 only at the moment, and it will have devices
-	-- in OpenWrt 19.07 + 1 as well
-	handle_pkgs(lib.target_packages)
-	handle_pkgs(class_packages('standard'))
-
-	handle_target_pkgs(target_pkgs)
-end
 
 return lib