ARM: dts: bockw: SCIF0 supports RTS/CTS hardware flow control

On the BOCK-W development board, the RTS and CTS pins of the console
SCIF0 are wired to the "product serial" connector.  Reflect this in the
DTS by adding the "uart-has-rtscts" property to the scif0 device node.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7778-bockw.dts

@@ -223,6 +223,7 @@ &scif0 {
 	pinctrl-0 = <&scif0_pins>;
 	pinctrl-names = "default";
 
+	uart-has-rtscts;
 	status = "okay";
 };