regmap-irq: Place kernel doc of struct regmap_irq_chip in order

It seems that a couple of members got lost theirorder, put them back.
Besides that, split field descriptions into groups in the same way
as it's done in the structure definition.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230220153334.87049-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>