Add vulscan overlay defconfig file kernel/configs/vulscan.config MTK-Commit-Id: b1a757a132baddd2ad45d331ef1b424e15fd3258 Signed-off-by: Haodong.Zhang <haodong.zhang@mediatek.com> CR-Id: ALPS06470980 Feature: Configuration Change-Id: I74eb3be38a1e556c3a0d492462975062506fbeea