mfd: intel-m10-bmc: Split into core and spi specific parts

Split the common code from intel-m10-bmc driver into intel-m10-bmc-core
and move the SPI bus parts into an interface specific file.

intel-m10-bmc-core becomes the core MFD functions which can support
multiple bus interface like SPI bus.

Co-developed-by: Tianfei zhang <[email protected]>
Signed-off-by: Tianfei zhang <[email protected]>
Reviewed-by: Russ Weight <[email protected]>
Acked-by: Guenter Roeck <[email protected]> # hwmon
Reviewed-by: Xu Yilun <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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