net: ti: am65-cpsw-nuss: remove guards against !BRIDGE_VLAN_INFO_BRENTRY

Since commit 3116ad06 ("net: bridge: vlan: don't notify to switchdev
master VLANs without BRENTRY flag"), the bridge no longer emits
switchdev notifiers for VLANs that don't have the
BRIDGE_VLAN_INFO_BRENTRY flag, so these checks are dead code.
Remove them.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>