rtc: at91rm9200: Add sam9x60 compatible

Handle the sam9x60 RTC. While it can work with the at91sam9x5 fallback, it
has crystal correction support and doesn't need to shadow IMR.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20201117133920.1229679-1-alexandre.belloni@bootlin.com

drivers/rtc/rtc-at91rm9200.c

@@ -437,6 +437,9 @@ static const struct of_device_id at91_rtc_dt_ids[] = {
 	}, {
 		.compatible = "atmel,sama5d2-rtc",
 		.data = &sama5d4_config,
+	}, {
+		.compatible = "microchip,sam9x60-rtc",
+		.data = &sama5d4_config,
 	}, {
 		/* sentinel */
 	}