ALSA: dt019x: merge into the als100 driver

The als100 driver is so similar to the dt019x/als007 driver
that one driver's source can be used for both drivers with
only few changes. Merge the dt019x driver into the als100.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>