Add version number to ReportPerformance::Histogram

Test: dumpsys media.log -r
Bug: 68148948
Change-Id: Ide3da6d4f079ed9d457c6c76374b14b9e0163a4e
diff --git a/media/libnblog/PerformanceAnalysis.cpp b/media/libnblog/PerformanceAnalysis.cpp
index ca9bc2c..94ad114 100644
--- a/media/libnblog/PerformanceAnalysis.cpp
+++ b/media/libnblog/PerformanceAnalysis.cpp
@@ -80,7 +80,7 @@
 std::string Histogram::toString() const {
     std::stringstream ss;
     static constexpr char kDivider = '|';
-    ss << mBinSize << "," << mNumBins << "," << mLow << ",{";
+    ss << kVersion << "," << mBinSize << "," << mNumBins << "," << mLow << ",{";
     bool first = true;
     if (mLowCount != 0) {
         ss << "-1" << kDivider << mLowCount;