MLK-25105-2: dts: arm64: imx8mp-ab2: use AK5552 compatible for sound card

Use "fsl,imx-audio-ak5552" compatible in AK5552 audio card node
in order to enforce proper constraints on number of channels.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
(cherry picked from commit 7075d4f1698c5c95f0c382c8a2000b8999a39176)