Remove ttyFIQ0 as it is no longer used

Author: ayufan

rootfs/make_rootfs.sh

@@ -255,10 +255,6 @@ fe00::0 ip6-localnet
 ff00::0 ip6-mcastprefix
 ff02::1 ip6-allnodes
 ff02::2 ip6-allrouters
-EOF
-		cat >> "$DEST/etc/securetty" <<EOF
-# Rock 64
-ttyFIQ0
 EOF
 		for arch in $EXTRA_ARCHS; do
 			if [[ "$arch" != "$BUILD_ARCH" ]]; then