minijail: Allow tmpfs /tmp mount without a chroot.

There's no need to require a chroot to mount a clean tmpfs /tmp.
Also, halve the size of the tmpfs to 64M.

BUG=brillo:439
TEST=Unit tests, security_Minijail pass.
TEST='minijail0 -u nobody -g nobody -t -- mount' shows tmpfs mount.

Change-Id: Iee84160cee0487a0e7e0807b64ba54f6b3980e83
Reviewed-on: https://chromium-review.googlesource.com/255650
Commit-Queue: Jorge Lucangeli Obes <[email protected]>
Trybot-Ready: Jorge Lucangeli Obes <[email protected]>
Tested-by: Jorge Lucangeli Obes <[email protected]>
Reviewed-by: Lee Campbell <[email protected]>
2 files changed