pinctrl: baytrail: Fix types of config value in byt_pin_config_set()

When unpacked, the config value is split to two of different types.
Fix the types accordingly.

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