Delete CarStatsPuller class

The CarStatsPuller class is not needed because CarStatsService will now
directly register the VMS_CLIENT_STATS puller with StatsManager.

Test: m -j
Bug: 148123503
Change-Id: Icd46af829c8f559315f72feab1eda3b687c57148

core/java/Android.bp

@@ -7,8 +7,3 @@ filegroup {
     name: "IDropBoxManagerService.aidl",
     srcs: ["com/android/internal/os/IDropBoxManagerService.aidl"],
 }
-
-filegroup {
-    name: "ICarStatsService.aidl",
-    srcs: ["com/android/internal/car/ICarStatsService.aidl"],
-}