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: I32fadfb42eb5fd08b13b9da0ee025ca54bfcf2e5
1 file changed