ALSA: aoa: Convert onyx and tas codec drivers to module_i2c_driver

This patch converts onyx and tas codec drivers to use the module_i2c_driver()
macro which makes the code smaller and a bit simpler.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>