gbproxy: Remove NUM_BVC_PER_NSE constant and constant-sized array

Let's use a 'record of' with indefinite length in order to be able to
dynamically adjust the number of BSSGP_BVC_CT references based on how
many BVCs we have configured.

Change-Id: Id4aa20ff0b553cb8a1f5a67faa1e7b237fb254b8
1 file changed