DISTRO_FEATURES: add i2s option
DISTRO_FEATURES: add i2s option

This adds i2s feature that enables I²S muxing on Edison/Arduino by defining
MUX_I2S flag.

Signed-off-by: Ferry Toth <b7ff6f7d33f1b320413095ad62cad5fa92c49512@exalondelft.nl>

westeri/meta-acpi,westeri/meta-acpi