add Lancom 1790 vaw (#2814)

* add lancom 1790vaw

* add lancom 1790vaw pictures

* add wlan and os

* adjust wlan name

* correct wlan type

* seems like default_platform is not supported

* Update 1790VAW.yaml

---------

Co-authored-by: Harry <Harry@cadby.co.uk>

device-types/LANCOM/1790VAW.yaml

@@ -0,0 +1,36 @@
+---
+manufacturer: LANCOM
+model: 1790VAW
+slug: lancom-1790vaw
+part_number: '62111'
+u_height: 0
+is_full_depth: false
+weight: 520
+weight_unit: g
+airflow: passive
+front_image: true
+rear_image: true
+subdevice_role: child
+comments: '[LANCOM 1790VAW Data sheet](https://www.lancom-systems.de/download/LC-1790VAW/DS_1790VAW_DE.pdf)'
+power-ports:
+  - name: PS1
+    type: dc-terminal
+    maximum_draw: 17
+interfaces:
+  - name: ETH-1
+    type: 1000base-t
+  - name: ETH-2
+    type: 1000base-t
+  - name: ETH-3
+    type: 1000base-t
+  - name: ETH-4
+    type: 1000base-t
+  - name: VDSL/ADSL
+    type: xdsl
+  - name: WLAN-1
+    type: ieee802.11n
+console-ports:
+  - name: USB
+    type: usb-a
+  - name: com
+    type: mini-din-8