Support frontend status readiness query.

The caller could use it to check whether frontend status is ready to
read or not.

Bug: 171540820
Fix: 171540820
Test: atest android.media.tv.tuner.cts on AIDL and HILD HALs
Change-Id: I55610e02412d6043e7fab91d1a2bf187a8e5e3ba
diff --git a/media/jni/tuner/FrontendClient.cpp b/media/jni/tuner/FrontendClient.cpp
index bea0342..c6337ec 100644
--- a/media/jni/tuner/FrontendClient.cpp
+++ b/media/jni/tuner/FrontendClient.cpp
@@ -152,6 +152,16 @@
     return Result::INVALID_STATE;
 }
 
+vector<FrontendStatusReadiness> FrontendClient::getStatusReadiness(
+        const std::vector<FrontendStatusType>& statusTypes) {
+    vector<FrontendStatusReadiness> readiness;
+    if (mTunerFrontend != nullptr) {
+        mTunerFrontend->getFrontendStatusReadiness(statusTypes, &readiness);
+    }
+
+    return readiness;
+}
+
 shared_ptr<ITunerFrontend> FrontendClient::getAidlFrontend() {
     return mTunerFrontend;
 }