Limit default capabilities to Android B+

It's possible that OEMs or device manufacturers may have relied on the
previous behavior (where interfaces without specified capabilities would
have minimal capabilities) to prevent certain Ethernet interfaces from
becoming the default network. To avoid breaking existing device
configuration, creating default network capabilities is limited by the
SDK level.

Bug: 399549599
Flag: EXEMPT bugfix
Test: atest ConnectivityCoverageTests
Change-Id: I46dc9fb02347710b09c0d2e8125b84a95f99fc9b
1 file changed