rtc: rv8803: Extend compatibility with the rx8900

The Seiko Epson's RTC RX8900 layout register is compatible with the
RV8803. So let's add its ID in order to reuse the same driver.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index f883aa2..7155c08 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -502,6 +502,7 @@
 
 static const struct i2c_device_id rv8803_id[] = {
 	{ "rv8803", 0 },
+	{ "rx8900", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, rv8803_id);