ARM: dts: kirkwood: ts219: disable the SoC's RTC

The internal RTC doesn't work, loading the driver only yields

	rtc-mv f1010300.rtc: internal RTC not ticking

. So disable it.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Acked-by: Martin Michlmayr <tbm@cyrius.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

arch/arm/boot/dts/kirkwood-ts219.dtsi

@@ -104,3 +104,11 @@ &pciec {
 &pcie0 {
 	status = "okay";
 };
+
+&rtc {
+	/*
+	 * There is a s35390a available on the i2c bus, the internal rtc isn't
+	 * working (probably no crystal assembled).
+	 */
+	status = "disabled";
+};