usb: musb: Set up function pointers for DMA

Set up function pointers for DMA so get closer to
being able to build in all the DMA engines.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index ab7ec09..7539c31 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
@@ -357,7 +357,7 @@
 	return retval;
 }
 
-void dma_controller_destroy(struct dma_controller *c)
+void musbhs_dma_controller_destroy(struct dma_controller *c)
 {
 	struct musb_dma_controller *controller = container_of(c,
 			struct musb_dma_controller, controller);
@@ -369,8 +369,10 @@
 
 	kfree(controller);
 }
+EXPORT_SYMBOL_GPL(musbhs_dma_controller_destroy);
 
-struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *base)
+struct dma_controller *musbhs_dma_controller_create(struct musb *musb,
+						    void __iomem *base)
 {
 	struct musb_dma_controller *controller;
 	struct device *dev = musb->controller;
@@ -398,7 +400,7 @@
 	if (request_irq(irq, dma_controller_irq, 0,
 			dev_name(musb->controller), &controller->controller)) {
 		dev_err(dev, "request_irq %d failed!\n", irq);
-		dma_controller_destroy(&controller->controller);
+		musb_dma_controller_destroy(&controller->controller);
 
 		return NULL;
 	}
@@ -407,3 +409,4 @@
 
 	return &controller->controller;
 }
+EXPORT_SYMBOL_GPL(musbhs_dma_controller_create);