Remove workaround for LP#1767422
Remove workaround for LP#1767422

Since [1] and [2], the workaround done in [3] is no longer needed
because we set the port tag when is bound and fixed the VLAN tag
setting.

[1]https://review.opendev.org/c/openstack/neutron/+/819567
[2]https://review.opendev.org/c/openstack/neutron/+/820897
[3]https://review.opendev.org/c/openstack/neutron/+/566864

Closes-Bug: #1980126
Related-Bug: #1767422

Change-Id: Iee35cde7bbfee0e809cf71c4542dfbdefc97209f

mahak/neutron,mahak/neutron,openstack/neutron,mahak/neutron,openstack/neutron,openstack/neutron