pinctrl: baytrail: Switch to use intel_pinctrl_get_soc_data()

Since we have common helper to retrieve SoC data from driver data
we may switch to use it.

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