[Provider Model] Gate merged carrier Wi-Fi offload Suggestion

Gate permission to use merged carrier Wi-Fi offload suggestions
with the Carrier Configuration which indicates that the carrier will
configure Carrier Wi-Fi offload networks.

Bug: 181277417
Test: atest com.android.server.wifi
Test: atest android.net.wifi
Change-Id: I864c8fbd0949a38a7fe66c612e20467bc4f3be0f
5 files changed