pinctrl: intel: Allow drivers to define total amount of IRQs per community

Some of the pin control devices may not be capable to generate IRQ
per each pin in the community. Allow individual drivers to define
total amount of IRQs per community.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>