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>
