docs: move openrisc documentation under Documentation/arch/

Architecture-specific documentation is being moved into Documentation/arch/
as a way of cleaning up the top-level documentation directory and making
the docs hierarchy more closely match the source hierarchy.  Move
Documentation/openrisc into arch/ and fix all in-tree references.

Cc: Jonas Bonn <[email protected]>
Cc: Stefan Kristiansson <[email protected]>
Cc: Stafford Horne <[email protected]>
Acked-by: Alex Shi <[email protected]>
Reviewed-by: Yanteng Si <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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