dt-bindings: tegra: Document SHIELD TV 2015

The SHIELD TV 2015 is a consumer media Android device that is based on
P2571

Change-Id: Ib981728d277f7daca812223ec3534d98555d43a1
Signed-off-by: Aaron Kling <webgeek1234@gmail.com>

Documentation/devicetree/bindings/arm/tegra.yaml

@@ -240,6 +240,17 @@ properties:
           - const: google,smaug-rev1
           - const: google,smaug
           - const: nvidia,tegra210
+      - description: NVIDIA Shield TV 2015
+        items:
+          - const: nvidia,p2571-0930
+          - const: nvidia,foster_e
+          - const: nvidia,tegra210
+      - description: NVIDIA Shield TV Pro 2015
+        items:
+          - const: nvidia,p2571-0932
+          - const: nvidia,foster_e_hdd
+          - const: nvidia,foster_e
+          - const: nvidia,tegra210
       - description: Jetson TX2 Developer Kit
         items:
           - const: nvidia,p2771-0000