gpiolib: acpi: Move adev member to struct acpi_gpio_info

The further improvements are based on this change since
struct acpi_gpio_lookup is not available in some cases.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>