Don't double lock when resetting jank tests

Fixes: 180875541
Test: adb shell dumpsys com.android.systemui reset
Change-Id: Ie656730bbbbb249e6798617cf236b93332e79eb6

libs/hwui/JankTracker.cpp

@@ -236,7 +236,6 @@ void JankTracker::dumpFrames(int fd) {
 }
 
 void JankTracker::reset() {
-    std::lock_guard lock(mDataMutex);
     mFrames.clear();
     mData->reset();
     (*mGlobalData)->reset();

libs/hwui/renderthread/RenderProxy.cpp

@@ -230,7 +230,10 @@ void RenderProxy::dumpProfileInfo(int fd, int dumpFlags) {
 }
 
 void RenderProxy::resetProfileInfo() {
-    mRenderThread.queue().runSync([=]() { mContext->resetFrameStats(); });
+    mRenderThread.queue().runSync([=]() {
+        std::lock_guard lock(mRenderThread.getJankDataMutex());
+        mContext->resetFrameStats();
+    });
 }
 
 uint32_t RenderProxy::frameTimePercentile(int percentile) {