[RESEND PATCH v13 4/6] fpga: dfl: move dfl bus related APIs to include/linux/dfl.h

Now the dfl drivers could be made as independent modules and put in different folders according to their functionalities. In order for scattered dfl device drivers to include dfl bus APIs, move the dfl bus APIs to a new header file in the public folder. [m...@kernel.org: Fixed up header guards to

[PATCH v13 4/6] fpga: dfl: move dfl bus related APIs to include/linux/dfl.h

Now the dfl drivers could be made as independent modules and put in different folders according to their functionalities. In order for scattered dfl device drivers to include dfl bus APIs, move the dfl bus APIs to a new header file in the public folder. [m...@kernel.org: Fixed up header guards to