fpga: dfl: create a dfl bus type to support DFL devices

A new bus type "dfl" is introduced for private features which are not
initialized by DFL feature drivers (dfl-fme & dfl-afu drivers). So these
private features could be handled by separate driver modules.

DFL feature drivers (dfl-fme, dfl-port) will create DFL devices on
enumeration. DFL drivers could be registered on this bus to match these
DFL devices. They are matched by dfl type & feature_id.

[[email protected]: Add missing Documentation part to MAINTAINERS file]

Signed-off-by: Xu Yilun <[email protected]>
Signed-off-by: Wu Hao <[email protected]>
Signed-off-by: Matthew Gerlach <[email protected]>
Signed-off-by: Russ Weight <[email protected]>
Reviewed-by: Tom Rix <[email protected]>
Acked-by: Wu Hao <[email protected]>
Signed-off-by: Moritz Fischer <[email protected]>

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