pinctrl: cherryview: Drop stale comment

There is no more .groups member in struct chv_pinctrl,
drop associated comment because it's not applicable anymore.

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

drivers/pinctrl/intel/pinctrl-cherryview.c

@@ -86,9 +86,6 @@ struct intel_pad_context {
  * @irq: Our parent irq
  * @intr_lines: Mapping between 16 HW interrupt wires and GPIO offset (in GPIO number space)
  * @saved_intmask: Interrupt mask saved for system sleep
- *
- * The first group in @groups is expected to contain all pins that can be
- * used as GPIOs.
  */
 struct chv_pinctrl {
 	struct device *dev;