ALSA: emu10k1: enable TAD mic out on Audigy

Enable TAD output on Audigy naming it "Phone Output",
to be consistent with TAD input which is called "Phone".

According to Creative doc
( http://support.creative.com/kb/ShowArticle.aspx?sid=3026

 )
this should output just mic signal.

Signed-off-by: Maciej Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Takashi Iwai <tiwai@suse.de>