ipq40xx-generic: add working VDSL config for FB7530

this does not do anything as long as the DSL port is unplugged.
If the port is plugged and an interface of type pppoe exists, the vrx518 dsl firmware and the pppd daemon is started

targets/ipq40xx-generic

@@ -60,12 +60,9 @@ device('avm-fritz-box-7530', 'avm_fritzbox-7530', {
 		'-ath10k-firmware-qca4019-ct',
 
 		-- VDSL modem
-		'-kmod-ltq-vdsl-vr11',
-		'-kmod-ltq-vdsl-vr11-mei',
-		'-ltq-vdsl-vr11-app',
-		'-ltq-dsl-base',
-		'-kmod-atm',
-		'-linux-atm',
+		'ppp',
+		'kmod-ppp',
+		'ppp-mod-pppoe',
 	},
 })