enter_chroot.sh: mount configfs

DevServer will need configfs mounted inside chroot to be able to
create/manipulate iSCSI targets.

BUG=chromium:570766
TEST=`cros_sdk --enter` works, configfs is mounted inside chroot.

Change-Id: I7f7f8dfa4fcf4a062c2378f212b99fddd48bc22b
Reviewed-on: https://chromium-review.googlesource.com/343572
Commit-Ready: Victor Dodon <printesoi@chromium.org>
Tested-by: Victor Dodon <printesoi@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed