pinctrl: nomadik: add clk_prepare() call

We now strictly require clk_prepare() calls to be issued before
any clk_enable() calls.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
index b26395d..ba7122f 100644
--- a/drivers/pinctrl/pinctrl-nomadik.c
+++ b/drivers/pinctrl/pinctrl-nomadik.c
@@ -1246,6 +1246,7 @@
 		ret = PTR_ERR(clk);
 		goto out_unmap;
 	}
+	clk_prepare(clk);
 
 	nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
 	if (!nmk_chip) {