[ALSA] snd-emu10k1: Enable speakers on Audigy 2 ZS Notebook.

Modules: EMU10K1/EMU10K2 driver

Description:
This enables the 7.1 speaker output of the Audigy 2 ZS Notebook.
Further towards fixing ALSA bug#927
TODO:
SPDIF/IEC958 output. (untested, might already work)
Sound capture. (untested, might already work.)

Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>