arm64: dts: renesas: r9a07g043: Add SPI Multi I/O Bus controller node

Add SPI Multi I/O Bus controller node to R9A07G043 (RZ/G2UL) SoC DTSI.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220502190155.84496-1-biju.das.jz@bp.renesas.com


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