Skip LinkAddress tests that are R-specific on Q

Address lifetime was added in R so tests for it should not be run on Q.

Test: CtsNetTestCasesLatestSdk:android.net.LinkAddressTest on both
          devices
Bug: 150918852
Merged-In: I98b14727eabcf569829eee8df34afc057eba6f93
(cherry picked from commit 4e00259d)

Change-Id: I9599afa8ae64bb13c93d5f26ebedf3f8dedff6d9