serial-dmm: sort the list of device drivers (part 1, bm25x)

serial-dmm: sort the list of device drivers (part 1, bm25x)

The previous implementation seems to have added drivers in their "order
of appearance". Start sorting the rather long list, to simplify several
tasks: Add new entries as more drivers get written, find existing items
during research, identify and compare similar models during maintenance.
As a byproduct, there will be no doubt about where to put things during
future work :) and duplicates will be spotted immediately.

This commit puts 'bm25x' meters into one group. And comments on the sort
order and motivation for sorting the table.