audio : AM3517 : Adding i2c info for AIC23 codec

The i2c_board_info entry supporting AIC23 codec was added into
the i2c2 bus.

Signed-off-by: Abhilash K V <abhilash.kv@ti.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>