meta-facebook: harma: re-enable uart routing script

Re-add it because it was removed incorrectly last time.

Change-Id: Ia88dd1c53a2eef0402291a7c307eee1131b28d07
Signed-off-by: Peter Yin <peter.yin@quantatw.com>
diff --git a/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console_%.bbappend b/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console_%.bbappend
index dba7b3e..e500001 100644
--- a/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console_%.bbappend
+++ b/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console_%.bbappend
@@ -17,6 +17,8 @@
 
 OBMC_CONSOLE_TTYS:append = " ttyUSB1"
 
+SYSTEMD_OVERRIDE:${PN}:append = " setup-uart-routing.conf:obmc-console@ttyS2.service.d/setup-uart-routing.conf"
+
 do_install:append() {
         install -d ${D}${base_libdir}/udev/rules.d/
         install -m 0644 ${WORKDIR}/plat-80-obmc-console-uart.rules ${D}${base_libdir}/udev/rules.d/80-obmc-console-uart.rules