pinctrl: intel: platform: Add Panther Lake to the list of supported

Intel Panther Lake is supported by the generic platform driver,
so add it to the list of supported in Kconfig.

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