pinctrl: intel: No need to disable IRQs in the handler

In IRQ handler interrupts are already disabled, hence no need
to repeat it. Even in the threaded case, which is disabled here,
it is not a problem because IRQ framework serializes descriptor
handling. Remove disabling IRQ part in the handler.

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