pinctrl: cherryview: Switch to use struct intel_pinctrl

Now when all preparations are done we may easily switch to use
struct intel_pinctrl instead of custom one.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>