pinctrl: tangier: Introduce Intel Tangier driver

Intel Tangier implements the common pinctrl functionalities for
Merrifield and Moorefield platforms.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Link: https://lore.kernel.org/r/20230814054033.12004-2-raag.jadav@intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>