iio: pressure: bmp280: Explicitly mark GPIO optional

Show by using a corresponding API call that GPIO is optional.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Andy Shevchenko 2020-03-23 12:41:27 +02:00 • committed by Jonathan Cameron
commit df6e71256c