dt-bindings: arm: fsl: Add the S32V234-EVB board

Add entry for the NXP S32V234 Customer Evaluation Board to the board/SoC
bindings.

Signed-off-by: Eddy Petrișor <eddy.petrisor@nxp.com>
Signed-off-by: Stefan-Gabriel Mirea <stefan-gabriel.mirea@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>