systemd: remove console on virtual terminals

This reuses the same variable from sysvinit (USE_VT) to disable running
getty/login on virtual terminals.

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-core/systemd/systemd_%.bbappend

@@ -20,4 +20,9 @@ do_install:append () {
 SUBSYSTEM=="input", KERNEL=="event[0-9]*", ENV{ID_INPUT_TOUCHSCREEN}=="1", SYMLINK+="input/touchscreen0"
 EOF
     fi
+
+    # Disable virtual terminals
+    if [ "${USE_VT}" = "0" ]; then
+        sed -i -e "/getty@.service/s,enable,disable,g" ${D}${systemd_unitdir}/system-preset/90-systemd.preset
+    fi
 }