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/IpSecConfigTest.java

@@ -23,9 +23,6 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotSame;
 import static org.junit.Assert.assertNull;
 
-import android.os.Build;
-
-import androidx.test.filters.SdkSuppress;
 import androidx.test.filters.SmallTest;
 
 import org.junit.Test;
@@ -35,7 +32,6 @@ import org.junit.runners.JUnit4;
 /** Unit tests for {@link IpSecConfig}. */
 @SmallTest
 @RunWith(JUnit4.class)
-@SdkSuppress(minSdkVersion = Build.VERSION_CODES.S, codeName = "S")
 public class IpSecConfigTest {
 
     @Test