ALSA: keywest: Get rid of useless i2c_device_name() macro

The i2c_device_name() macro is used only once and doesn't have much
value, it hurts redability more than it helps. Get rid of it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>