Don't remount rootdir readonly

We want to keep rootdir read-write.

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
init.rc: disable zygote and surfacemanager service

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
init.rc: drop unuse serverices

We do not need these service nomatter run android init directly or
execute in lxc

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>