Enable checkstyle repo upload hook for tests

Bug: 115719623
Test: import unused classes and try to repo upload, checkstyle will
block it

Change-Id: I063b9946df6c3d852506449221a7f04d6f9c656f

PREUPLOAD.cfg

@@ -8,6 +8,11 @@ checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPL
                       services/print/
                       services/usb/
                       telephony/
+                      tests/ActivityViewTest/
+                      tests/LotsOfApps/
+                      tests/NativeProcessesMemoryTest/
+                      tests/OdmApps/
+                      tests/SystemMemoryTest/
                       wifi/
 
 api_lint_hook = ${REPO_ROOT}/frameworks/base/tools/apilint/apilint_sha.sh ${PREUPLOAD_COMMIT}