pinctrl: intel: Extract intel_pinctrl_get_soc_data() helper for wider use

intel_pinctrl_get_soc_data() helper can be used in few driver instead of
open-coded variants. Thus, extract it as a standalone API.

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