bridge: T4632: vlan aware bridge lacks CPU forwarding

The VLAN aware bridge was forwarding traffic between member ports, but traffic
destined torwards the CPU was dropped. This resulted in a gateway not reachable
or DHCP leases that could not be handed out.

Tested via:

VyOS
set interfaces bridge br0 enable-vlan
set interfaces bridge br0 member interface eth1 allowed-vlan '10'
set interfaces bridge br0 member interface eth1 allowed-vlan '20'
set interfaces bridge br0 member interface eth1 allowed-vlan '30'
set interfaces bridge br0 member interface eth1 allowed-vlan '40'
set interfaces bridge br0 member interface eth1 native-vlan '40'
set interfaces bridge br0 member interface eth2 allowed-vlan '30'
set interfaces bridge br0 member interface eth2 allowed-vlan '20'
set interfaces bridge br0 member interface eth2 allowed-vlan '10'
set interfaces bridge br0 member interface eth2 allowed-vlan '40'
set interfaces bridge br0 vif 10 address '10.0.10.1/24'
set interfaces bridge br0 vif 20 address '10.0.20.1/24'
set interfaces bridge br0 vif 30 address '10.0.30.1/24'
set interfaces bridge br0 vif 40 address '10.0.40.1/24'

Arista vEOS

vlan 10,20,30,40
interface Ethernet1
   switchport trunk allowed vlan 10,20,30,40
interface Vlan10
   ip address 10.0.10.2/24
interface Vlan20
   ip address 10.0.20.2/24
interface Vlan30
   ip address 10.0.30.2/24
interface Vlan40
   ip address 10.0.40.2/24
interface Ethernet1
   switchport trunk allowed vlan 10,20,30,40
   switchport mode trunk
   spanning-tree portfast

Cisco vIOS

interface GigabitEthernet0/0
 ip address 10.0.40.3 255.255.255.0
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/0.10
 encapsulation dot1Q 10
 ip address 10.0.10.3 255.255.255.0
!
interface GigabitEthernet0/0.20
 encapsulation dot1Q 20
 ip address 10.0.20.3 255.255.255.0
!
interface GigabitEthernet0/0.30
 encapsulation dot1Q 30
 ip address 10.0.30.3 255.255.255.0
!

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