Replaces the capitalized I2S tag with i2s as tags in Zephyr are
by convention lower case.
Unexpectedly built the i2s echo sample when given the lower case tag in the
ignore.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Add a sample intended to show how to use I2S drivers in processing of
audio streams. The sample starts both the RX and TX streams and adds
a simple echo effect to the received audio signal.
Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>