NFC: pn544: Convert to use GPIO descriptor

Since we got rid of platform data, the driver may use
GPIO descriptor directly.

This change fixes a potential issue of double freeing GPIOs in ACPI
case by converting to devm_gpiod_get().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>