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Add device nodes for the SPI Multi I/O Bus Controllers (RPC-IF) on the
various R-Car Gen3 SoCs that do not have support for them yet in their
device trees (R-Car H3, M3-W, M3-W+, M3-N, E3, and D3).

Based on patches in the BSP by Valentine Barshak.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/3231749c7b63df1a2134daabe66446a3e0e5515b.1648548339.git.geert+renesas@glider.be