sm looks for the init script to manage dnsmasq, so
remove sysvinit from DISTRO_FEATURES_BACKFILL_CONSIDERED
to avoid init scripts being removed.
Partial-Bug: 1897685
Change-Id: I39d67e2bed981f50cc9399ef20942fee48c4f22c
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>