[Test] Add mtcs tag to CtsHostsideNetworkTests

The test relies on the tethering module code. Test is supposed to run on the matching version of module prebuilt. Add mtcs tag to ensure this.

Bug: 316939964
Change-Id: I2b4d212a7dadf11e847abc5b6855442fdcc87a7c
diff --git a/tests/cts/hostside/Android.bp b/tests/cts/hostside/Android.bp
index e55ba63..a0aafc6 100644
--- a/tests/cts/hostside/Android.bp
+++ b/tests/cts/hostside/Android.bp
@@ -43,6 +43,8 @@
     test_suites: [
         "cts",
         "general-tests",
+        "mcts-tethering",
+        "mts-tethering",
         "sts"
     ],
     data: [