USB: ehci: ohci: Add clk_{un}prepare() support

clk_{un}prepare is mandatory for platforms using common clock framework. Since
these drivers are used by SPEAr platform, which supports common clock framework,
add clk_{un}prepare() support for them.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ohci-spear.c

@@ -25,12 +25,12 @@ struct spear_ohci {
 
 static void spear_start_ohci(struct spear_ohci *ohci)
 {
-	clk_enable(ohci->clk);
+	clk_prepare_enable(ohci->clk);
 }
 
 static void spear_stop_ohci(struct spear_ohci *ohci)
 {
-	clk_disable(ohci->clk);
+	clk_disable_unprepare(ohci->clk);
 }
 
 static int __devinit ohci_spear_start(struct usb_hcd *hcd)