ARM: dts: aspeed: minerva: change RTC reference

Change the RTC reference from on-chip to externel on i2c bus 9 and address
is 0x51.

Signed-off-by: Yang Chen <yang.chen@quantatw.com>
Link: https://lore.kernel.org/r/20240626130332.929534-5-yangchen.openbmc@gmail.com
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-minerva.dts

@@ -95,10 +95,6 @@
 	};
 };
 
-&rtc {
-	status = "okay";
-};
-
 &sgpiom0 {
 	status = "okay";
 	ngpios = <128>;
@@ -308,6 +304,11 @@
 		compatible = "atmel,24c64";
 		reg = <0x50>;
 	};
+
+	rtc@51 {
+		compatible = "nxp,pcf8563";
+		reg = <0x51>;
+	};
 };
 
 &i2c10 {