mfd: lpc_ich: Move APL GPIO resources to a custom structure

We are expecting more platforms that want to instantiate
the GPIO device via P2SB. For them prepare the custom structure
and move Apollo Lake data there. Refactor the code accordingly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230926190834.932233-3-andriy.shevchenko@linux.intel.com


Signed-off-by: Lee Jones <lee@kernel.org>