Add enterprise to metered APN

In consistent with S, enterprise APN type is considered metered, move
from hard coded Dctracker setup evaluation to the config default value.

Bug: 284152056
Test: daily testing (b/288038359 : p23 + b/288038354: P22 )
Change-Id: I4d71f5f260d131fe6f6341c13c2e3e7628b3f740