dt-bindings: arm: rockchip: add PX30-Cobra boards from Theobroma Systems

Cobra are Touchscreen devices built around the PX30 SoC using
a variety of display options.

The devices feature an EMMC, network port, usb host + OTG ports and
a 720x1280 display with a touchscreen.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Link: https://lore.kernel.org/r/20250514150745.2437804-4-heiko@sntech.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: Heiko Stuebner

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -1126,6 +1126,16 @@ properties:
               - rockchip,rv1126
               - rockchip,rv1109
 
+      - description: Theobroma Systems PX30-Cobra
+        items:
+          - enum:
+              - tsd,px30-cobra-ltk050h3146w
+              - tsd,px30-cobra-ltk050h3146w-a2
+              - tsd,px30-cobra-ltk050h3148w
+              - tsd,px30-cobra-ltk500hd1829
+          - const: tsd,px30-cobra
+          - const: rockchip,px30
+
       - description: Theobroma Systems PX30-uQ7 with Haikou baseboard
         items:
           - const: tsd,px30-ringneck-haikou