overlays: i2c-rtc: pcf8563 supports wakeup-source

PCF8563 has alarm functionality, so allow it to accept the
wakeup-source parameter.

See: #6030

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

arch/arm/boot/dts/overlays/i2c-rtc-common.dtsi

@@ -348,6 +348,7 @@
 				<&ds3231>,"wakeup-source?",
 				<&mcp7940x>,"wakeup-source?",
 				<&mcp7941x>,"wakeup-source?",
-				<&m41t62>,"wakeup-source?";
+				<&m41t62>,"wakeup-source?",
+				<&pcf8563>,"wakeup-source?";
 	};
 };