spi: dt-bindings: fsl-dspi: add dmas and dma-names properties

Add dmas and dma-names properties because dspi support dma transfer.
Fix below warnings:
arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28-var1.dtb: spi@2120000: Unevaluated properties are not allowed ('dma-names', 'dmas', 'little-endian' were unexpected)
        from schema $id: http://devicetree.org/schemas/spi/fsl,dspi.yaml#

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://patch.msgid.link/20240703165931.2325807-1-Frank.Li@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>