Dynamically set mesh-local addresses preferred lifetime.

When there is an active OMR address(not deprecated), set the mesh-local
addresses as non-preferred. When there is no active OMR address, set
the mesh-local addresses as preferred.

Bug: 323624146

Test: atest ThreadNetworkIntegrationTests

Change-Id: I969c20ddadfd2d0bd97499da48efc9b32cfa7e0b
5 files changed