fix: Shutdown/reboot sequence in kernel not ROM.

-Falsely report mmcblk0p9 as mounted ro in /proc/mounts, when
in fact is it mounted as rw...

-This should replace this patch
https://github.com/Team-Exhibit/beanstalk_system_core/commit/b8f2329d4642f76e679fe9f340e97ff49923aa6c