Remove incorrect spaces in various macro expansions

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Use minimal fs image for pandaboard

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Merge branch 'master' of git://coop.tuna.tsinghua.edu.cn/git/ucore_plus
Merge branch 'master' of https://github.com/zivv/ucore_plus
add linux fb subsystem