Be consistent with the rest of the code and make clear when the
driver accesses ports. For this rename num_phys to num_ports.
Additionally make the device specific port numbers a define and
use them in the configuration structure.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/23230
Signed-off-by: Robert Marko <robimarko@gmail.com>