Point to the new checkstyle location for packages/apps/Settings PREUPLOAD hook.

This change depends on r.android.com/314437

Bug: 33666900
Test: None
Change-Id: Ibcf177186e64e7e34493301f109ea9d4454fa3a2

PREUPLOAD.cfg

 [Hook Scripts]
-checkstyle_hook = ../../../development/tools/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
+checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
                   -fw src/com/android/settings/print/