Third round of new drivers, features and cleanups for IIO in the 3.14 cycle. One new driver a spot of new functionality and a cleanup. * New driver for the Capella CM32181 ambient light sensor. This is the first driver directly from Kevin at Capella with more already in the pipeline. * Support for configurable predividers on the mxs lradc * Convert a field to a bitmap in mxs lradc instead of using an array of unsigned longs to store boolean values.