init-ifupdown: disable wlan interfaces on non-wireless variants

Added a post-installation script to disable the wireless interfaces on
module variants without wireless support.

This fixes following messages on boot:

wlan: driver load failure
modprobe: can't load module wlan (extra/wlan.ko): No such device
...

https://jira.digi.com/browse/DEL-3781

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-core/init-ifupdown/init-ifupdown_1.0.bbappend

@@ -1,4 +1,4 @@
-# Copyright (C) 2013 Digi International.
+# Copyright (C) 2013-2017 Digi International Inc.
 
 FILESEXTRAPATHS_prepend := "${THISDIR}/${BP}:"
 
@@ -138,3 +138,21 @@ do_install_append_ccimx6ul() {
 	sed -i -e "s,##WLAN1_STATIC_GATEWAY##,${WLAN1_STATIC_GATEWAY},g" ${D}${sysconfdir}/network/interfaces
 	sed -i -e "s,##WLAN1_STATIC_DNS##,${WLAN1_STATIC_DNS},g" ${D}${sysconfdir}/network/interfaces
 }
+
+# Disable wireless interfaces on first boot for non-wireless variants
+pkg_postinst_${PN}() {
+	if [ -n "$D" ]; then
+		exit 1
+	fi
+
+	if [ ! -d "/proc/device-tree/wireless" ]; then
+		sed -i -e '/^auto wlan/{s,^,#,g};/^auto p2p/{s,^,#,g}' /etc/network/interfaces
+	fi
+
+	# Create the symlinks in the different runlevels
+	if type update-rc.d >/dev/null 2>/dev/null; then
+		update-rc.d ${INITSCRIPT_NAME} ${INITSCRIPT_PARAMS}
+	fi
+
+	exit 0
+}