We do not provide WAN in SLE at all (it lives in the -optional subpackage, so
is Leap only). Provided:
* no our customer apparently uses this,
* is poorly maintained upstream (hdlc in particular),
* it's unlikely TW/Leap users run this (but not impossible),
* we diverge from SLE configs,
we should consider disabling whole WAN in TW and Leap too.

The proposed config change is:
@@ -4217,20 +4217,7 @@ CONFIG_QTNFMAC=m
 CONFIG_QTNFMAC_PCIE=m
 CONFIG_MAC80211_HWSIM=m
 CONFIG_VIRT_WIFI=m
-CONFIG_WAN=y
-CONFIG_HDLC=m
-CONFIG_HDLC_RAW=m
-CONFIG_HDLC_RAW_ETH=m
-CONFIG_HDLC_CISCO=m
-CONFIG_HDLC_FR=m
-CONFIG_HDLC_PPP=m
-CONFIG_HDLC_X25=m
-CONFIG_FRAMER=m
-CONFIG_PCI200SYN=m
-CONFIG_WANXL=m
-CONFIG_PC300TOO=m
-CONFIG_FARSYNC=m
-CONFIG_LAPBETHER=m
+# CONFIG_WAN is not set
 CONFIG_IEEE802154_DRIVERS=m
 CONFIG_IEEE802154_FAKELB=m
 # CONFIG_IEEE802154_AT86RF230 is not set
@@ -4658,7 +4645,7 @@ CONFIG_SERIAL_MCTRL_GPIO=y
 CONFIG_SERIAL_NONSTANDARD=y
 # CONFIG_MOXA_INTELLIO is not set
 CONFIG_MOXA_SMARTIO=m
-CONFIG_N_HDLC=m
+# CONFIG_N_HDLC is not set
 CONFIG_IPWIRELESS=m
 CONFIG_N_GSM=m
 CONFIG_NOZOMI=m