Add service to preupload checkstyle_hook

Test: Upload a commit with change in BluetoothManagerService
Change-Id: I293d68e8dc35066c9ddacf9096a42129cf5bafa0

PREUPLOAD.cfg

@@ -16,5 +16,6 @@ checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPL
                       android/app/lib/mapapi/com/android/bluetooth/mapapi/
                       android/app/tests/src/com/android/bluetooth/
                       framework/
+                      service/
 aosp_first = ${REPO_ROOT}/frameworks/base/tools/aosp/aosp_sha.sh ${PREUPLOAD_COMMIT} ${PREUPLOAD_FILES}
 yapf_hook = ./system/tools/scripts/yapf_checker.py