net: bridge: replace struct br_vlan_stats with pcpu_sw_netstats

Struct br_vlan_stats duplicates pcpu_sw_netstats (apart from
br_vlan_stats not defining an alignment requirement), therefore
switch to using the latter one.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/04d25c3d-c5f6-3611-6d37-c2f40243dae2@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>