fix overlay path

Change-Id: I7d65688aa9ff9ce0a457fd673a9f2b173f63936d
copy from g2-common (lgl22 dependency)

Change-Id: I2233f9db0e492e6c038a473d9fbe4d2230c39978
try external sd mount (ng yet)

Change-Id: I015eda59ed20d0432e51183c6daa1e6f052292d6
change inherit timing

Change-Id: If90793fcb864228b78f5b8bf8cc7b3f356383c45