Make the global i2c address configurable to support compatible amplifiers
with different global i2c address.
Signed-off-by: Gergo Koteles <soyer@irl.hu>
Link: https://lore.kernel.org/r/a252f1efeed5049f027f01e699c9e10e1e05bf9e.1703891777.git.soyer@irl.huSigned-off-by: Takashi Iwai <tiwai@suse.de>