rtc: pcf8563: add Microcrystal RV8564 compatible

Add a compatible string for the Microcrystal RV8564.

Link: https://lore.kernel.org/r/20190829212547.19185-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/pcf8563.txt

@@ -3,7 +3,9 @@
 Philips PCF8563/Epson RTC8564 Real Time Clock
 
 Required properties:
-- compatible: Should contain "nxp,pcf8563" or "epson,rtc8564".
+- compatible: Should contain "nxp,pcf8563",
+	"epson,rtc8564" or
+	"microcrystal,rv8564"
 - reg: I2C address for chip.
 
 Optional property:

drivers/rtc/rtc-pcf8563.c

@@ -633,6 +633,7 @@ MODULE_DEVICE_TABLE(i2c, pcf8563_id);
 static const struct of_device_id pcf8563_of_match[] = {
 	{ .compatible = "nxp,pcf8563" },
 	{ .compatible = "epson,rtc8564" },
+	{ .compatible = "microcrystal,rv8564" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, pcf8563_of_match);