feat(morello): add support for I2S audio

Add support for Morello I2S audio subsystem. This includes adding the
audio formatter and I2S transmitter nodes and gluing them together with
the hdmi codec using a simple sound card machine node.

Change-Id: I3de4b06ef965c8e0555d074118b944fe6b4b78bb
Signed-off-by: Anurag Koul <anurag.koul@arm.com>
Signed-off-by: Faiz Abbas <faiz.abbas@arm.com>
2 files changed