Add scripts to run lint on sysui

The run_lint script takes 2 params, the first is top of tree, the
second is a git change SHA. Only if the change contains changes to
sysui does the lint get run (this allows it to not affect other
uploads as a preupload hook).

Test: ./tools/lint/run_lint.sh $ANDROID_BUILD_TOP <SHA>
Change-Id: Id23b879610b3d33c5bf9e47812f0a85f6aeffdde