There is no point in keeping the AR40xx driver as a patch as its
not pending merge or backport.
To allow for easier maintenance until DSA is ready move it into
files like EDMA is.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
[combine with removal from patches-5.4]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
