Move in-tree vendor VIF_TYPE_* constants

Move in-tree vendor VIF_TYPE_* constants

VIF_TYPE_* constants[1] defines all vif types BUT vendor ones are only
used by in-tree/out-of-tree vendor code. This changes moves in-tree
VIF_TYPE_* constants[2] to vendor modules to ensure they will be removed
from neutron code on decomposition.

[1] in neutron.extensions.portbindings
[2] VIF_TYPE_HYPERV/IB_HOSTDEV/HW_WEB/VROUTER

Change-Id: Iee73426221d693689ba24d2ce2660bb7351f02fc
Partial-Bug: #1486279