1. Delete some useless files 2. Add .gitignore file 3. add cv181x board configs Change-Id: I1f09f71cfa2cc6ee9ab5d8ad3d3570a48a9e9ba3
repo: https://github.com/u-boot/u-boot commit: d80bb749fab53da72c4a0e09b8c2d2aaa3103c91 Change-Id: Ie6434426e1ec15bc08bb1832798e371f3fd5fb29