Not every pin can be configured. Add missed check to prevent access
violation.

Fixes: 4e80c8f5 ("pinctrl: intel: Add Intel Merrifield pin controller support")
Acked-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>