[ARM] pxa: don't pass a consumer clock name for devices with unique clocks

Where devices only have one consumer, passing a consumer clock ID
has no real benefit.  Remove it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index e294d43..e44dc2c 100644
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -296,7 +296,7 @@
 		return -ENXIO;
 	}
 
-	usb_clk = clk_get(&pdev->dev, "USBCLK");
+	usb_clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(usb_clk))
 		return PTR_ERR(usb_clk);