sblim-sfcb: do not use 'exit 1' to postpone to first boot

Since `939f7f1 meta/lib/oe/rootfs.py: do not execute
defer_to_first_boot when processing postinst_intercept hooks' applied
in oe-core, use defer_to_first_boot rather than `exit 1' to postpone
to first boot

Remove duplicated `systemctl enable', it is done in systemd.bbclass

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-extended/sblim-sfcb/sblim-sfcb_1.4.9.bb

@@ -68,14 +68,8 @@ do_install() {
 }
 
 pkg_postinst_${PN} () {
-    OPTS=""
-
     if [ x"$D" != "x" ]; then
-        OPTS="--root=$D"
-        if type systemctl >/dev/null 2>/dev/null; then
-                systemctl $OPTS ${SYSTEMD_AUTO_ENABLE} ${SYSTEMD_SERVICE}
-        fi
-        exit 1
+        $INTERCEPT_DIR/postinst_intercept delay_to_first_boot ${PKG} mlprefix=${MLPREFIX}
     fi
 
     ${datadir}/sfcb/genSslCert.sh ${sysconfdir}/sfcb