pinctrl: intel: Drop unnecessary check for predefined features

None of the drivers is overriding features. Remove unnecessary check.
While here, rename rev to value to make easier further development.

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