This reverts commit c053b225731e81826b5b8acb144ac68f4ae14d30.
KSZ DSA driver is the only thing in the kernel selecting DCB support
instead of depending on it if required.
So, it will enable DCB support without asking and we do not want the
kernel size increase, as well as current Layerscape ARMv8 build failure.
So, revert this until its fixed upstream or worked around.
Signed-off-by: Robert Marko <robimarko@gmail.com>
b897db9c44