[doxygen] Do not sort member docs
[doxygen] Do not sort member docs

Things are grouped by association within source files. Sorting by
name effectively breaks the grouping in the resulting documentation.

Signed-off-by: Simo Piiroinen <6d5e5360bed3d486f7d9fb26b0f737f7d4fd45ee@jollamobile.com>

spiiroin/mce-dev,spiiroin/mce-dev