the structs and methods for managing devlink are
all under the `devlink_linux.go` file, and when
trying to write code in a non linux system (mac),
the editor doesn't recognize any of it.
this commit moves struct definitions from the
devlink_linux.go file and creates a
devlink_unspecified.go with the devlink funcs.
this is similar to what we have in netlink_unspecified.go
Signed-off-by: Bernardo Soares <20172413+bersoare@users.noreply.github.com>
Bernardo Soares