gpiolib: Deduplicate some code in for_each_requested_gpio_in_range()

gpiolib: Deduplicate some code in for_each_requested_gpio_in_range()

Refactor for_each_requested_gpio_in_range() to deduplicate some code
which is basically repeats the for_each_hwgpio(). In order to achieve
this, split the latter to two, for_each_hwgpio_in_range() and
for_each_hwgpio().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250207151149.2119765-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>