soc: renesas: ARCH_R9A07G043 depends on !RISCV_ISA_ZICBOM

ARCH_R9A07G043 has its own non-standard global pool based DMA coherent
allocator, which conflicts with the remap based RISCV_ISA_ZICBOM version.
Add a proper dependency.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231018052654.50074-4-hch@lst.de


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