Drivers: hv: Enable protocol negotiation with win8 hosts

Now that we have implemented all of the Win8 (WS2012) functionality, negotiate
Win8 protocol with the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 8c3cb1f..5095b06 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -434,6 +434,7 @@
 
 #define VERSION_INVAL -1
 
+#define VERSION_CURRENT VERSION_WIN8
 
 /* Make maximum size of pipe payload of 16K */
 #define MAX_PIPE_DATA_PAYLOAD		(sizeof(u8) * 16384)