rtc: at91rm9200: add sama5d4 and sama5d2 compatibles

Both the sama5d4 and sama5d2 RTCs have more features than the previous
RTCs, add a compatible string for them.

Link: https://lore.kernel.org/r/20191229204421.337612-3-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/atmel,at91rm9200-rtc.yaml

@@ -17,6 +17,8 @@ properties:
     enum:
       - atmel,at91rm9200-rtc
       - atmel,at91sam9x5-rtc
+      - atmel,sama5d4-rtc
+      - atmel,sama5d2-rtc
       - microchip,sam9x60-rtc
 
   reg:

drivers/rtc/rtc-at91rm9200.c

@@ -312,6 +312,12 @@ static const struct of_device_id at91_rtc_dt_ids[] = {
 	}, {
 		.compatible = "atmel,at91sam9x5-rtc",
 		.data = &at91sam9x5_config,
+	}, {
+		.compatible = "atmel,sama5d4-rtc",
+		.data = &at91rm9200_config,
+	}, {
+		.compatible = "atmel,sama5d2-rtc",
+		.data = &at91rm9200_config,
 	}, {
 		/* sentinel */
 	}