memory: dfl-emif: add the DFL EMIF private feature driver

This driver is for the EMIF private feature implemented under FPGA
Device Feature List (DFL) framework. It is used to expose memory
interface status information as well as memory clearing control.

The purpose of memory clearing block is to zero out all private memory
when FPGA is to be reprogrammed. This gives users a reliable method to
prevent potential data leakage.

[[email protected]: Fixed up ABI doc]

Reviewed-by: Tom Rix <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Xu Yilun <[email protected]>
Signed-off-by: Russ Weight <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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