Reset arguments after emitting a perfetto event

We were always resetting arguments but this was left to the caller
and was one more non-trivial JNI call. While we are in the library
code we should just reset the arguments right away

Test: atest PerfettoTraceTest
Bug: 303199244
Flag: android.os.perfetto_sdk_tracing_v2
Change-Id: If093c436c24b5519a98d19f7ccf7171f1ded3793

Author: zezeozue

libs/tracing_perfetto/tracing_sdk.cpp

@@ -38,7 +38,7 @@ void trace_event(int type, const PerfettoTeCategory* perfettoTeCategory,
     PerfettoTeHlEmitImpl(perfettoTeCategory->impl, type,
                          type == PERFETTO_TE_TYPE_COUNTER ? nullptr : name,
                          extra->get());
-    extra->pop_extra();
+    extra->clear_extras();
   }
 }