meta-facebook: harma: enable uart4 flow control

Enable uart cts/rst to avoid uart data loss.

Change-Id: I115b55cc19dc2a30f58cece208d425fc16d2ca46
Signed-off-by: Peter Yin <peter.yin@quantatw.com>
diff --git a/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console/setup-uart-routing b/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console/setup-uart-routing
index 9df066b..92fa139 100644
--- a/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console/setup-uart-routing
+++ b/meta-facebook/meta-harma/recipes-phosphor/console/obmc-console/setup-uart-routing
@@ -7,3 +7,6 @@
 
 connect_uart_route "uart1" "uart4"
 connect_uart_route "io1" "uart2"
+
+# Enable UART4/ttyS2 flow contorl
+stty -F /dev/ttyS2 crtscts