wwan: Add support for Gemalto Cinterion cellular modules

Includes specific support for PH8(1e2d-0053) / ELS61(1e2d-005b) modules.

Note for ELS61, the serial driver changes from serial option(ttyUSB) to usb-cdc (ttyACM).

Two additional fixes in this commit resolve issues with ttyACM devices: -

* wwan.sh - sys-fs has a subdirectory indirection (*/tty/ttyACMx) which was not handled properly
* wwan.usb - dependent scripts were not included, so this never actually called proto_set_available for example (and relied on inadvertent call for ttyUSB case)

Signed-off-by: David Thornley <david.thornley@touchstargroup.com>
(cherry picked from commit cb262b0939)

package/network/utils/wwan/files/data/1e2d-0053

@@ -0,0 +1,6 @@
+{
+	"desc": "Cinterion PH8",
+	"control": 2,
+	"data": 3
+}
+

package/network/utils/wwan/files/data/1e2d-005b

@@ -0,0 +1,5 @@
+{
+	"desc": "Cinterion ELS61",
+	"control": 1,
+	"data": 0
+}

package/network/utils/wwan/files/wwan.sh

@@ -59,7 +59,7 @@ proto_wwan_setup() {
 		json_set_namespace $old_cb
 
 		[ -n "$control" -a -n "$data" ] && {
-			ttys=$(ls -d /sys/bus/usb/devices/$devicename/${devicename}*/tty* | sed "s/.*\///g" | tr "\n" " ")
+			ttys=$(ls -d /sys/bus/usb/devices/$devicename/${devicename}*/tty?* /sys/bus/usb/devices/$devicename/${devicename}*/tty/tty?* | sed "s/.*\///g" | tr "\n" " ")
 			ctl_device=/dev/$(echo $ttys | cut -d" " -f $((control + 1)))
 			dat_device=/dev/$(echo $ttys | cut -d" " -f $((data + 1)))
 			driver=comgt

package/network/utils/wwan/files/wwan.usb

@@ -1,5 +1,10 @@
+#!/bin/sh
+
 [ "$ACTION" = add -a "$DEVTYPE" = usb_device ] || exit 0
 
+. /lib/functions.sh
+. /lib/netifd/netifd-proto.sh
+
 vid=$(cat /sys$DEVPATH/idVendor)
 pid=$(cat /sys$DEVPATH/idProduct)
 [ -f "/lib/network/wwan/$vid:$pid" ] || exit 0