Reapply "ANDROID: fix up rpmsg_device ABI break"

This reverts commit c1ac0c4c.

Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Ib5bf80e4402521097db6a2ef589cea9ac71370ff

drivers/rpmsg/rpmsg_core.c

@@ -652,7 +652,7 @@ int rpmsg_register_device_override(struct rpmsg_device *rpdev,
 
 	device_initialize(dev);
 	if (driver_override) {
-		ret = driver_set_override(dev, &rpdev->driver_override,
+		ret = driver_set_override(dev, (const char **)&rpdev->driver_override,
 					  driver_override,
 					  strlen(driver_override));
 		if (ret) {

include/linux/rpmsg.h

@@ -54,7 +54,7 @@ struct rpmsg_channel_info {
 struct rpmsg_device {
 	struct device dev;
 	struct rpmsg_device_id id;
-	const char *driver_override;
+	char *driver_override;
 	u32 src;
 	u32 dst;
 	struct rpmsg_endpoint *ept;