[ALSA] Select I2C and I2C_POWERMAC in aoa/codecs/Kconfig

Added the missing selection of I2C and I2C_POWERMAC
for Onyx and TAS codecs in aoa/codecs/Kconfig.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>