dt-bindings: Add Starry KR122EA0SRA panel binding

The Starry KR122EA0SRA is a 12.2", 1920x1200 TFT-LCD panel connected
using eDP interfaces.
Signed-off-by: NDouglas Anderson <dianders@chromium.org>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/display/panel/starry,kr122ea0sra.txt

+Starry 12.2" (1920x1200 pixels) TFT LCD panel
+
+Required properties:
+- compatible: should be "starry,kr122ea0sra"
+
+This binding is compatible with the simple-panel binding, which is specified
+in simple-panel.txt in this directory.