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Add support for RZ/G3E xSPI. Compared to RPC-IF, it can support writes on memory-mapped area. Introduce struct rpcif_impl for holding the function pointers and data to handle the differences between xspi and rpc-if interface. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Link: https://lore.kernel.org/r/20250424090000.136804-7-biju.das.jz@bp.renesas.com Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>