pinctrl: intel: Add default case to intel_config_set_pull()

For the sake of symmetry with intel_config_get_pull(), add
a default case to the outer switch.

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