MFC: r233310

Add snd_cmi, snd_csa and snd_emu10kx to GENERIC on i386 and amd64.

The GPL infected parts which were blocking the inclusion of snd_csa
and snd_emu10kx in GENERIC have recently been removed from the tree.

Requested by: joel
Discussed with: jhb, joel, Yuriy Tsibizov <yuriy.tsibizov@gfk.ru>
Approved by: jhb (mentor)