dt-bindings: samsung: Document binding for new Odroid HC1 board

Document the binding for new Hardkernel Odroid HC1 board.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/samsung/samsung-boards.txt

@@ -57,6 +57,7 @@ Required root node properties:
 	- "hardkernel,odroid-xu3-lite" - for Exynos5422-based Hardkernel
 					 Odroid XU3 Lite board.
 	- "hardkernel,odroid-xu4" - for Exynos5422-based Hardkernel Odroid XU4.
+	- "hardkernel,odroid-hc1" - for Exynos5422-based Hardkernel Odroid HC1.
 
   * Insignal
 	- "insignal,arndale"      - for Exynos5250-based Insignal Arndale board.