Fix universe to include arm LINT kernel configs.

Strip comments from the NOTES.armv[57] files as is done for other
NOTES files when building the corresponding LINT configs. Without
this, the LINT configs contained the NO_UNIVERSE comment from the
NOTES.armv[57] files.

Reviewed by: imp
MFC after: 1 week
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D21264