1. Fix the issue that root directory of disk can’t be used as WORKSPACE.
2. Update AutoGen code style to pass C++ compiler.
Signed-off-by: lgao4
Reviewed-by: jsu1
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12676 6f19259b-4bc3-4df7-8a09-765794883524