riscv: only select DMA_DIRECT_REMAP from RISCV_ISA_ZICBOM and ERRATA_THEAD_PBMT

RISCV_DMA_NONCOHERENT is also used for whacky non-standard
non-coherent ops that use different hooks in dma-direct.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Robin Murphy <[email protected]>
Reviewed-by: Lad Prabhakar <[email protected]>
Tested-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

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