1. 181x support secureboot 2. add .gitignore Change-Id: I34cd45663d92eeb8e3b5ddfbf1a876111ce46bd1
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626