omap: rx51: Add i2c2 board_info with tlv320aic3x

This makes possible to probe the audio codec and add another i2c2
components in the future.

Fix also indentation for the first omap_register_i2c_bus.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>