Squashed 'dts/upstream/' content from commit aaba2d45dc2a

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diff --git a/Bindings/arc/hsdk.txt b/Bindings/arc/hsdk.txt
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+Synopsys DesignWare ARC HS Development Kit Device Tree Bindings
+---------------------------------------------------------------------------
+
+ARC HSDK Board with quad-core ARC HS38x4 in silicon.
+
+Required root node properties:
+    - compatible = "snps,hsdk";