Add modules partition

Add updateable_module_file that describes all files under /modules. If
more directories (e.g. /modules/apex etc.) are added in the future,
separate labels should be applied to them.

Bug: 163543381
Test: on CF check /proc/mounts

Change-Id: Iceafebd85a2ffa47a73dce70d268d8a6fb5a5103
3 files changed