arm64: dts: imx8-ss-dma: enable dma support for lpspi

Add DMA configurations for LPSPI nodes on i.MX8QX/QM/DXL.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>