[VTS] Update validateDisplay with frameIntervalNs

Test: atest VtsHalGraphicsComposer3_TargetTest
BUG: 284845445
Change-Id: I4821a535518b113923fac02adadb3f4867ce922e
diff --git a/graphics/composer/aidl/vts/VtsComposerClient.h b/graphics/composer/aidl/vts/VtsComposerClient.h
index 20dc733..b45c71f 100644
--- a/graphics/composer/aidl/vts/VtsComposerClient.h
+++ b/graphics/composer/aidl/vts/VtsComposerClient.h
@@ -197,6 +197,7 @@
     std::vector<RefreshRateChangedDebugData> takeListOfRefreshRateChangedDebugData();
 
     static constexpr int32_t kMaxFrameIntervalNs = 50000000;  // 20fps
+    static constexpr int32_t kNoFrameIntervalNs = 0;
 
   private:
     void addDisplayConfigs(VtsDisplay*, const std::vector<DisplayConfiguration>&);