rtc: rv8803: add epson,rx8803 and epson,rx8900 compatible

The RX8803 and RX8900 register layouts are compatible with the one of
the RV8803. So add these to the compatibles.

The same compatible strings are used and approved in linux kernel.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Reviewed-by: Michael Walle <michael@walle.cc>

drivers/rtc/rv8803.c

@@ -157,6 +157,8 @@ static const struct rtc_ops rv8803_rtc_ops = {
 
 static const struct udevice_id rv8803_rtc_ids[] = {
 	{ .compatible = "microcrystal,rv8803", },
+	{ .compatible = "epson,rx8803" },
+	{ .compatible = "epson,rx8900" },
 	{ }
 };