Fix CTS test failed on R device

The test failed since the API is not available on R device.
Add conditions to ignore it.

Test: atest CtsHostsideNetworkTests:com.android.cts.net.HostsideVpnTests
      on R device
Bug: None
Change-Id: I05a1f63adec72e89382cb095db714bccbdff0058
diff --git a/tests/cts/hostside/app/Android.bp b/tests/cts/hostside/app/Android.bp
index 9903756..5fb28e2 100644
--- a/tests/cts/hostside/app/Android.bp
+++ b/tests/cts/hostside/app/Android.bp
@@ -26,6 +26,7 @@
         "ctstestrunner-axt",
         "ub-uiautomator",
         "CtsHostsideNetworkTestsAidl",
+        "modules-utils-build",
     ],
     libs: [
         "android.test.runner",