ARM: dts: imx6*-hummingboard2: remove non-mainline property from RTC

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-hummingboard2.dtsi

@@ -167,7 +167,6 @@ &i2c1 {
 	pcf8523: rtc@68 {
 		compatible = "nxp,pcf8523";
 		reg = <0x68>;
-		nxp,12p5_pf;
 	};
 
 	sgtl5000: codec@0a {