staging: fsl-mc: make fsl_mc_get_root_dprc public

fsl_mc_get_root_dprc is needed by other components (e.g. vfio) to find
the root dprc
Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/fsl-mc-bus.c

@@ -265,8 +265,8 @@ EXPORT_SYMBOL_GPL(fsl_mc_bus_exists);
 /**
 * fsl_mc_get_root_dprc - function to traverse to the root dprc
 */
-static void fsl_mc_get_root_dprc(struct device *dev,
-				 struct device **root_dprc_dev)
+void fsl_mc_get_root_dprc(struct device *dev,
+			  struct device **root_dprc_dev)
 {
 	if (WARN_ON(!dev)) {
 		*root_dprc_dev = NULL;
@@ -278,6 +278,7 @@ static void fsl_mc_get_root_dprc(struct device *dev,
 			*root_dprc_dev = (*root_dprc_dev)->parent;
 	}
 }
+EXPORT_SYMBOL_GPL(fsl_mc_get_root_dprc);
 
 static int get_dprc_attr(struct fsl_mc_io *mc_io,
 			 int container_id, struct dprc_attributes *attr)

drivers/staging/fsl-mc/include/mc.h

@@ -191,6 +191,9 @@ void fsl_mc_driver_unregister(struct fsl_mc_driver *driver);
 
 bool fsl_mc_bus_exists(void);
 
+void fsl_mc_get_root_dprc(struct device *dev,
+			  struct device **root_dprc_dev);
+
 int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
 					u16 mc_io_flags,
 					struct fsl_mc_io **new_mc_io);