initscripts: avoid checkroot tries weird stuff on squashfs volumes
initscripts: avoid checkroot tries weird stuff on squashfs volumes

Since we don't have r/w volumes for normal and recovery operation but add
the r/w feature later via overlayfs, skip try fix / volumes or turning
on swap.

Signed-off-by: Jens Rehsack <69d49c504a9219a55b8be0f905e8fe3c32ffb57f@netbsd.org>

rdm-dev/meta-jens,rdm-dev/meta-jens,rdm-dev/meta-jens,rdm-dev/meta-jens