Fix thermalserviced_tmpfs compat recording mistake.

Commit: 2490f1ad meant to add
thermalserviced_tmpfs to the new_object list in the mapping file,
but copy-paste error resulted in thermalserviced_exec_tmpfs being
recorded instead.  Fix this.

(cherry-pick of commit: fbacc656)

Bug: 62573845
Test: None. prebuilt change.
Change-Id: Iab4eaef04742187d6397a539aae854651caa9935

prebuilts/api/26.0/26.0.ignore.cil

@@ -19,6 +19,6 @@
     thermalcallback_hwservice
     thermalserviced
     thermalserviced_exec
-    thermalserviced_exec_tmpfs
+    thermalserviced_tmpfs
     timezone_service
     tombstoned_java_trace_socket))