ehci-atmel.c: prepare clk before calling enable

Replace clk_enable/disable with clk_prepare_enable/disable_unprepare to
avoid common clk framework warnings.
Signed-off-by: NBoris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-atmel.c

@@ -37,15 +37,15 @@ static int clocked;
 
 static void atmel_start_clock(void)
 {
-	clk_enable(iclk);
-	clk_enable(fclk);
+	clk_prepare_enable(iclk);
+	clk_prepare_enable(fclk);
 	clocked = 1;
 }
 
 static void atmel_stop_clock(void)
 {
-	clk_disable(fclk);
-	clk_disable(iclk);
+	clk_disable_unprepare(fclk);
+	clk_disable_unprepare(iclk);
 	clocked = 0;
 }