gpio: mlxbf2: Drop wrong use of ACPI_PTR()

ACPI_PTR() is more harmful than helpful. For example, in this case
if CONFIG_ACPI=n, the ID table left unused which is not what we want.

Instead of adding ifdeffery here and there, drop ACPI_PTR() and
replace acpi.h with mod_devicetable.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Asmaa Mnehi <asmaa@nvidia.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>