Add reserved disk GID to critical component.

We recently created a new GID that can be granted to critical system
processes, so that the system is usable enough for the user to free
up disk space used by abusive apps.

Test: builds, boots
Bug: 62024591
Change-Id: I4d0ad5f368dfdac21ad4cfcbda69881c82edadc1
1 file changed