pinctrl: lynxpoint: Reuse struct intel_pinctrl in the driver

We may use now available struct intel_pinctrl in the driver.
No functional change implied.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>