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As per sgtl5000.yaml, '#sound-dai-cells' is a required property.

Pass it to fix the following schema warnings:

imx53-mba53.dtb: sgtl5000@a: '#sound-dai-cells' is a required property
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>