Create TEST_MAPPING for com.android.internal.net

The existing tests in this directory are VpnProfileTest and
NetworkUtilsInternalTest. Both tests are in FrameworksNetTests.
Create the TEST_MAPPING to ensure the expected tests are run.
Add in postsubmit before presubmit.

Test: atest --test-mapping core/java/com/android/internal/net:postsubmit
Change-Id: I9393f22fcba8539522382afa3bcc49ac23d22778
1 file changed