pinctrl: cherryview: Don't use selection 0 to mark an interrupt line as unused

pinctrl: cherryview: Don't use selection 0 to mark an interrupt line as unused

The selection 0 is a perfectly valid, so stop using it to have
the special meaning of interrupt line not used in the intr_lines.

Instead introduce a special CHV_INVALID_HWIRQ value, derived
from INVALID_HWIRQ. which is never a valid selection and use
that to indicate unused interrupt lines.

Cc: Yauhen Kharuzhy <jekhor@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>