iio: afe: rescale: expose scale processing function

[ Upstream commit bc437f75

 ]

In preparation for the addition of kunit tests, expose the logic
responsible for combining channel scales.

Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Reviewed-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220213025739.2561834-2-liambeguin@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Stable-dep-of: bee44839

 ("iio: afe: rescale: Accept only offset channels")
Signed-off-by: Sasha Levin <sashal@kernel.org>