mtd: spi-nor: core: Add helpers to read/write any register

There are manufacturers that use registers indexed by address. Some of
them support "read/write any register" opcodes. Provide core methods that
can be used by all manufacturers. SPI NOR controller ops are intentionally
not supported as we intend to move all the SPI NOR controller drivers
under the SPI subsystem.

Signed-off-by: Tudor Ambarus <[email protected]>
Signed-off-by: Pratyush Yadav <[email protected]>
Tested-by: Takahiro Kuwano <[email protected]>
Reviewed-by: Pratyush Yadav <[email protected]>
Reviewed-by: Michael Walle <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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