Drivers: hv: vmbus: Export the vmbus_set_event() API

In preparation for moving some ring buffer functionality out of the
vmbus driver, export the API for signaling the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 66226ce..40fd608 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1365,4 +1365,5 @@
 
 int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id,
 				  const uuid_le *shv_host_servie_id);
+void vmbus_set_event(struct vmbus_channel *channel);
 #endif /* _HYPERV_H */