pinctrl: intel: Always use gpp_num_padown_regs in the main driver

For the size-based communities, always use gpp_num_padown_regs,
which is now provided explicitly via INTEL_COMMUNITY_SIZE() macro.

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