xen: sync include/xen/interface/io/ring.h with Xen's newest version
commit 629a5d87 upstream. Sync include/xen/interface/io/ring.h with Xen's newest version in order to get the RING_COPY_RESPONSE() and RING_RESPONSE_PROD_OVERFLOW() macros. Note that this will correct the wrong license info by adding the missing original copyright notice. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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