ARM: dts: imx6qdl-icore-rqs: Move Sound nodes to dtsi

imx6q, imx6dl icore-rqs modules share common sound nodes,
so move the sound nodes from imx6q-icore-rqs into dtsi so-that
both can share the common node details.

And also replace codec: sgtl5000@0a => sgtl5000: codec@a
on imx6q-icore-rqs.dts to [label:] node-name[@unit-address]
according to devicetree specification from ePAPER v1.1

Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>