Fixed duplicate APN issue

Telephony sent back to back setup data call
request with identical APN settings due to
out-of-sync between APN context and data
connection. When DCT check for compatible
data connection to reuse, we should directly
use the state from data connection.

Bug: 139701568
Test: Unit tests
Change-Id: Ia216d0ae8398ef004ca9de16c48a945adaa323d4