[media] V4L: pxa_camera: add clk_prepare/clk_unprepare calls

This patch adds clk_prepare/clk_unprepare calls to the pxa_camera
driver by using the helper functions clk_prepare_enable and
clk_disable_unprepare.
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/pxa_camera.c

@@ -921,12 +921,12 @@ static void pxa_camera_activate(struct pxa_camera_dev *pcdev)
 		/* "Safe default" - 13MHz */
 		recalculate_fifo_timeout(pcdev, 13000000);
 
-	clk_enable(pcdev->clk);
+	clk_prepare_enable(pcdev->clk);
 }
 
 static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev)
 {
-	clk_disable(pcdev->clk);
+	clk_disable_unprepare(pcdev->clk);
 }
 
 static irqreturn_t pxa_camera_irq(int irq, void *data)