Revert "Temporarily disable checkstyle hook"

This reverts commit 8497789b.

Reason for revert: This was fixed, see b/160796554

Bug: 160796554
Change-Id: I42f8d6b76c7319522239517ac3aff6eee7d9084b

PREUPLOAD.cfg

@@ -12,6 +12,8 @@ clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp
                services/incremental/
 
 [Hook Scripts]
+checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
+
 strings_lint_hook = ${REPO_ROOT}/frameworks/base/tools/stringslint/stringslint_sha.sh ${PREUPLOAD_COMMIT}
 
 hidden_api_txt_checksorted_hook = ${REPO_ROOT}/frameworks/base/tools/hiddenapi/checksorted_sha.sh ${PREUPLOAD_COMMIT} ${REPO_ROOT}