iio:light:gp2ap002 fix spelling typo in comments

Change the comment typo: "definately" -> "definitely".

Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1600772818-30882-1-git-send-email-wangqing@vivo.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>