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>

drivers/pinctrl/pinctrl-nomadik.c

@@ -1246,6 +1246,7 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
 		ret = PTR_ERR(clk);
 		goto out_unmap;
 	}
+	clk_prepare(clk);
 
 	nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
 	if (!nmk_chip) {