Support enable/disable Frontends.

Bug: 210199978
Test: atest VtsHalTvTunerTargetTest
Change-Id: I08411ef92d83be6623ed60565d65d6e9093405ad
diff --git a/tv/tuner/aidl/vts/functional/FrontendTests.h b/tv/tuner/aidl/vts/functional/FrontendTests.h
index 8f769a0..1745f76 100644
--- a/tv/tuner/aidl/vts/functional/FrontendTests.h
+++ b/tv/tuner/aidl/vts/functional/FrontendTests.h
@@ -100,6 +100,7 @@
     void tuneTest(FrontendConfig frontendConf);
     void scanTest(FrontendConfig frontend, FrontendScanType type);
     void debugInfoTest(FrontendConfig frontendConf);
+    void maxNumberOfFrontendsTest();
 
     void setDvrTests(DvrTests* dvrTests) { mExternalDvrTests = dvrTests; }
     void setDemux(std::shared_ptr<IDemux> demux) { getDvrTests()->setDemux(demux); }