ath79: add LTE packages for GL-XE300

Add LTE packages required for operating the LTE modems shipped with
the GL-XE300.

Example configuration for an unauthenticated dual-stack APN:

network.wwan0=interface
network.wwan0.proto='qmi'
network.wwan0.device='/dev/cdc-wdm0'
network.wwan0.apn='internet'
network.wwan0.auth='none'
network.wwan0.delay='10'
network.wwan0.pdptype='IPV4V6'

Signed-off-by: Tom Herbers <[email protected]>

target/linux/ath79/image/nand.mk

@@ -199,7 +199,8 @@ define Device/glinet_gl-xe300
   SOC := qca9531
   DEVICE_VENDOR := GL.iNet
   DEVICE_MODEL := GL-XE300
-  DEVICE_PACKAGES := kmod-usb2 block-mount kmod-usb-serial-ch341
+  DEVICE_PACKAGES := kmod-usb2 block-mount kmod-usb-serial-ch341 \
+	kmod-usb-net-qmi-wwan uqmi
   KERNEL_SIZE := 4096k
   IMAGE_SIZE := 131072k
   PAGESIZE := 2048