realtek: fix compile errors in dsa driver for 5.10

realtek: fix compile errors in dsa driver for 5.10

this patch fixes the following errors when compiling:

- dsa_switch_alloc is removed[1]

- a parameter "enum dsa_tag_protocol mprot" is added to dsa_tag_protocol
  in dsa_switch_ops (include/net/dsa.h)

- several paramters are added to "phylink_mac_link_up" in dsa_switch_ops
  (include/net/dsa.h)

  added:
    - int speed
    - int duplex
    - bool tx_pause
    - bool rx_pause

- a parameter "struct switchdev_trans *trans" is added to
  port_vlan_filtering in dsa_switch_ops (include/net/dsa.h)

[1]: https://lore.kernel.org/lkml/20191020031941.3805884-17-vivien.didelot@gmail.com/

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>