ARM: dts: imx6dl-plym2m: remove touchscreen-size-* properties

Remove touchscreen-size-* properties.  This values are not correct, event if it
works with ts_test tool, it fails to work properly with weston.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-plym2m.dts

@@ -138,8 +138,6 @@ touchscreen@0 {
 		interrupts-extended = <&gpio3 20 IRQ_TYPE_EDGE_FALLING>;
 		pendown-gpio = <&gpio3 20 GPIO_ACTIVE_LOW>;
 
-		touchscreen-size-x = <800>;
-		touchscreen-size-y = <480>;
 		touchscreen-inverted-x;
 		touchscreen-inverted-y;
 		touchscreen-max-pressure = <4095>;