There are currently two header files for the dsa driver. rtl83xx.h
and rtl838x.h. It is unclear for what reason they are separated.
Especially as one always includes the other. Merge those two files
into one.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/22931
Signed-off-by: Robert Marko <robimarko@gmail.com>