rpmsg: Move RPMSG_ADDR_ANY in user API

As the RPMSG_ADDR_ANY is a valid src or dst address that can be set by
user applications, migrate its definition in user API.

Reviewed-by: Bjorn Andersson <[e-mail]>
Reviewed-by: Mathieu Poirier <[e-mail]>
Signed-off-by: Arnaud Pouliquen <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

include/linux/rpmsg.h

···
 #include <linux/mutex.h>
 #include <linux/poll.h>
 #include <linux/rpmsg/byteorder.h>
-
-#define RPMSG_ADDR_ANY		0xFFFFFFFF
+#include <uapi/linux/rpmsg.h>
 
 struct rpmsg_device;
 struct rpmsg_endpoint;

include/uapi/linux/rpmsg.h

···
 #include <linux/ioctl.h>
 #include <linux/types.h>
 
+#define RPMSG_ADDR_ANY		0xFFFFFFFF
+
 /**
  * struct rpmsg_endpoint_info - endpoint info representation
  * @name: name of service