arm64: dts: renesas: r9a07g054: Add DMA support to RSPI

Add DMA properties to RSPI nodes to support DMA operation.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220728122312.189766-4-biju.das.jz@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>