fbdev: shmobile-lcdcfb: Convert to clk_prepare/unprepare

Turn clk_enable() and clk_disable() calls into clk_prepare_enable() and
clk_disable_unprepare() to get ready for the migration to the common
clock framework.

Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: linux-fbdev@vger.kernel.org
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/sh_mobile_lcdcfb.c

@@ -344,7 +344,7 @@ static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
 {
 	if (atomic_inc_and_test(&priv->hw_usecnt)) {
 		if (priv->dot_clk)
-			clk_enable(priv->dot_clk);
+			clk_prepare_enable(priv->dot_clk);
 		pm_runtime_get_sync(priv->dev);
 		if (priv->meram_dev && priv->meram_dev->pdev)
 			pm_runtime_get_sync(&priv->meram_dev->pdev->dev);
@@ -358,7 +358,7 @@ static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
 			pm_runtime_put_sync(&priv->meram_dev->pdev->dev);
 		pm_runtime_put(priv->dev);
 		if (priv->dot_clk)
-			clk_disable(priv->dot_clk);
+			clk_disable_unprepare(priv->dot_clk);
 	}
 }