pinctrl: apple: Make regmap_config static const and fix indentation

pinctrl: apple: Make regmap_config static const and fix indentation

Mark the regmap_config as static const since it is only used in this file
and never modified, allowing the compiler to optimize it and enforce
const-correctness.

Also fix minor indentation inconsistencies in function parameter alignment
to conform with kernel coding style.

Signed-off-by: John Madieu <john.madieu@labcsmart.com>
Link: https://lore.kernel.org/20250329181506.890043-1-john.madieu@labcsmart.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>