SF: Fix a mislabeled slice in traces

Bug: 185535769
Test: No slices named "operator()"
Change-Id: I2c5de9d391fbb8656ff7585bdcff23125388c4ba
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 768ae65..e11f40e 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -1276,8 +1276,9 @@
 }
 
 void SurfaceFlinger::disableExpensiveRendering() {
+    const char* const whence = __func__;
     auto future = mScheduler->schedule([=]() FTL_FAKE_GUARD(mStateLock) {
-        ATRACE_CALL();
+        ATRACE_NAME(whence);
         if (mPowerAdvisor.isUsingExpensiveRendering()) {
             for (const auto& [_, display] : mDisplays) {
                 constexpr bool kDisable = false;