Point to the new checkstyle location for frameworks/base PREUPLOAD hook.

This change depends on r.android.com/314437

Bug: 33666900
Test: None
Change-Id: I301723d516803146943f0866ea35b68cc36af6af
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index c28db57..75de4a7 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -1,5 +1,5 @@
 [Hook Scripts]
-checkstyle_hook = ../../development/tools/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
+checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
                   -fw core/java/android/animation/
                       core/java/android/hardware/usb/
                       core/java/android/print/