ASoC: More amlogic sound-name-prefix DT fixes

Merge series from Alexander Stein <alexander.stein@mailbox.org>:

Following up [1] here are more fix for missing sound-name-prefix
properties in the arch/arm64/boot/dts/amlogic/ subtree.

[1] https://www.spinics.net/lists/devicetree/msg466125.html