rpmsg: virtio_rpmsg_bus: move back rpmsg_hdr into a public header

Commit e88dae5 ("rpmsg: Move virtio specifics from public header")
has moved the struct rpmsg_hdr definition from the public rpmsg.h and
made it private to virtio_rpmsg_bus module. This structure is a common
header used in all virtio rpmsg messages, and used by various virtio
rpmsg bus drivers. So, move this back into the virtio_rpmsg specific
public header to make it visible to various rpmsg drivers.

Signed-off-by: Suman Anna <s-anna@ti.com>

drivers/rpmsg/virtio_rpmsg_bus.c

@@ -34,6 +34,7 @@
 #include <linux/rpmsg.h>
 #include <linux/mutex.h>
 #include <linux/of_device.h>
+#include <linux/rpmsg/virtio_rpmsg.h>
 
 #include "rpmsg_internal.h"
 
@@ -80,26 +81,6 @@ struct virtproc_info {
 /* The feature bitmap for virtio rpmsg */
 #define VIRTIO_RPMSG_F_NS	0 /* RP supports name service notifications */
 
-/**
- * struct rpmsg_hdr - common header for all rpmsg messages
- * @src: source address
- * @dst: destination address
- * @reserved: reserved for future use
- * @len: length of payload (in bytes)
- * @flags: message flags
- * @data: @len bytes of message payload data
- *
- * Every message sent(/received) on the rpmsg bus begins with this header.
- */
-struct rpmsg_hdr {
-	u32 src;
-	u32 dst;
-	u32 reserved;
-	u16 len;
-	u16 flags;
-	u8 data[0];
-} __packed;
-
 /**
  * struct rpmsg_ns_msg - dynamic name service announcement message
  * @name: name of remote service that is published

include/linux/rpmsg/virtio_rpmsg.h

@@ -0,0 +1,24 @@
+#ifndef _LINUX_RPMSG_VIRTIO_RPMSG_H
+#define _LINUX_RPMSG_VIRTIO_RPMSG_H
+
+/**
+ * struct rpmsg_hdr - common header for all virtio rpmsg messages
+ * @src: source address
+ * @dst: destination address
+ * @reserved: reserved for future use
+ * @len: length of payload (in bytes)
+ * @flags: message flags
+ * @data: @len bytes of message payload data
+ *
+ * Every message sent(/received) on the rpmsg bus begins with this header.
+ */
+struct rpmsg_hdr {
+	u32 src;
+	u32 dst;
+	u32 reserved;
+	u16 len;
+	u16 flags;
+	u8 data[0];
+} __packed;
+
+#endif