PBB provider instance port update

Created logical interface and internal phy for provider instance port ( #PIP ) in a provider backbone edge bridge ( #BEB ) in #bridge module. This will encapsulate the customer frames in #I-TAG and assigns a unique service instance. I-TAG will contain the backbone service instance identifier ( #I-SID ) with source and destination mac addresses in the backbone network.

#802-1AH update 13 ...
[commit 0d2acd86ee0fd53f5fbfb1e106cc313bb6e73a36]