Revert "Skip connectivity unit tests before S"

This reverts commit 05dd1ba540.

Reason for revert: Skips more tests than it should in AOSP
Bug: 192302892

Change-Id: I7c5638d8c1cc626354d240a06af758e1cdd92e94

tests/unit/java/android/net/MacAddressTest.java

@@ -22,9 +22,6 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
-import android.os.Build;
-
-import androidx.test.filters.SdkSuppress;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
@@ -39,7 +36,6 @@ import java.util.Random;
 
 @SmallTest
 @RunWith(AndroidJUnit4.class)
-@SdkSuppress(minSdkVersion = Build.VERSION_CODES.S, codeName = "S")
 public class MacAddressTest {
 
     static class AddrTypeTestCase {