Remove custom checkstyle check

This check existed for legacy RestrictTo annotation and @hide matching
in java files.

Bug: https://github.com/androidx/androidx/issues/475
Test: Upload with a simple java file modification
Change-Id: I955f5b882f6be3e27727b768bc04cb899b4c1502

Author: liutikas

PREUPLOAD.cfg

@@ -1,5 +1,5 @@
 [Hook Scripts]
-checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT} -c ${REPO_ROOT}/frameworks/support/development/checkstyle/config/support-lib.xml -p development/checkstyle/prebuilt/com.android.support.checkstyle.jar
+checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
 ktlint_hook = ${REPO_ROOT}/frameworks/support/development/ktlint.sh --skip-if-empty --file=${PREUPLOAD_FILES_PREFIXED}
 warn_check_api = ${REPO_ROOT}/frameworks/support/development/apilint.py -f ${PREUPLOAD_FILES}