staging: iio: tsl2x7x: remove unnecessary chip status checks in suspend/resume

tsl2x7x_suspend() and tsl2x7x_resume() both check to see what the
current chip status is. These checks are not necessary so this patch
removes those checks.

Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>