USB: HCD: Add usb_hcd prefix to exported functions

The convention is to prefix symbols exported from the USB HCD core with
"usb_hcd".  This change makes unmap_urb_setup_for_dma() and
unmap_urb_for_dma() consistent with that.

Signed-off-by: Robert Morell <rmorell@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/imx21-hcd.c b/drivers/usb/host/imx21-hcd.c
index f90d003..b7dfda8 100644
--- a/drivers/usb/host/imx21-hcd.c
+++ b/drivers/usb/host/imx21-hcd.c
@@ -927,7 +927,8 @@
 		if (state == US_CTRL_SETUP) {
 			dir = TD_DIR_SETUP;
 			if (unsuitable_for_dma(urb->setup_dma))
-				unmap_urb_setup_for_dma(imx21->hcd, urb);
+				usb_hcd_unmap_urb_setup_for_dma(imx21->hcd,
+					urb);
 			etd->dma_handle = urb->setup_dma;
 			etd->cpu_buffer = urb->setup_packet;
 			bufround = 0;
@@ -943,7 +944,7 @@
 		dir = usb_pipeout(pipe) ? TD_DIR_OUT : TD_DIR_IN;
 		bufround = (dir == TD_DIR_IN) ? 1 : 0;
 		if (unsuitable_for_dma(urb->transfer_dma))
-			unmap_urb_for_dma(imx21->hcd, urb);
+			usb_hcd_unmap_urb_for_dma(imx21->hcd, urb);
 
 		etd->dma_handle = urb->transfer_dma;
 		etd->cpu_buffer = urb->transfer_buffer;