Add pre-upload tool path for gofmt

Test: repo upload
Change-Id: I273b9d6a0cc3f25629f369616b8d62fccdaa0089

GLOBAL-PREUPLOAD.cfg

@@ -11,3 +11,4 @@ commit_msg_test_field = true
 [Tool Paths]
 clang-format = ${REPO_ROOT}/prebuilts/clang/host/${BUILD_OS}/clang-stable/bin/clang-format
 git-clang-format = ${REPO_ROOT}/prebuilts/clang/host/${BUILD_OS}/clang-stable/bin/git-clang-format
+gofmt = ${REPO_ROOT}/prebuilts/go/${BUILD_OS}/bin/gofmt