Staging: iio: Align function parameters to match first row

This patch improves coding style by aligning parameters in
iio/magnetometer function calls, to remove the following warning:
"CHECK: Alignment should match open parenthesis".

Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>