Fix race condition in data network

When data network is created, there is a window that
network capabilities are not created immediately. When data
network controller checks if the existing network can satisfied
the new network reuqest, this newly created network does not
have correct capabilities for data network controller to check.

Fixed by calling the update network capability method in data
network's constructor.

Fix: 229350075
Test: Manual && atest FrameworksTelephonyTests
Change-Id: I8dfd8a7e747d7dd21508e204239e81d285d3ae7f