Enable checkstyle everywhere in frameworks/base.

This was done in internal master in ag/5397886. Do it in AOSP as
well so we can benefit from checkstyle in AOSP as well.

Test: None
Change-Id: Ib00fc8d318e8127224846e0a69cb542178631437
Merged-In: I7d350c2bbb9fcd1019abd1addb035ce5e9e05acc

PREUPLOAD.cfg

 [Hook Scripts]
 checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
-                  -fw core/java/android/
-                      graphics/java/android
-                      core/tests/coretests/src/android/
-                      packages/PrintRecommendationService/
-                      packages/PrintSpooler/
-                      services/print/
-                      services/usb/
-                      telephony/
 
 api_lint_hook = ${REPO_ROOT}/frameworks/base/tools/apilint/apilint_sha.sh ${PREUPLOAD_COMMIT}