iio: temperature: tmp117: cosmetic alignment cleanup

Align the code correctly if possible and align the channel bit mask to
make it easier to read.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.kernel.org/r/20230228090518.529811-6-m.felsch@pengutronix.de


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