pinctrl: lynxpoint: Update summary in the driver

Reflect in the driver that it is now a pin control one.

While here, update copyright years and authors.

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>