pinctrl: amd: Don't access irq_data's hwirq member directly

There is an irqd_to_hwirq() intended to get the hwirq number. Switch
all use to it.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/20250821144942.2463014-1-superm1@kernel.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>