dt-bindings: Add BOE TV080WUM-NL0 panel binding

The BOE TV080WUM-NL0 is an 8.0", 1200x1920 (WUXGA) TFT-LCD panel
connected using four DSI lanes.
Signed-off-by: NChris Zhong <zyw@rock-chips.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/display/panel/boe,tv080wum-nl0.txt

+Boe Corporation 8.0" WUXGA TFT LCD panel
+
+Required properties:
+- compatible: should be "boe,tv080wum-nl0"
+
+This binding is compatible with the simple-panel binding, which is specified
+in simple-panel.txt in this directory.