ARM: dts: s5pv210: remove unused Atmel touchscreen properties in Goni

The Atmel bindings and driver do not use custom properties like
x/y-size, burst length, threshold and so on.  The driver gets necessary
data from the device directly.  Remove unused properties to fix
dtbs_check warning:

  arch/arm/boot/dts/s5pv210-goni.dt.yaml: touchscreen@4a:
    'atmel,burst-length', 'atmel,orientation', 'atmel,threshold', 'atmel,x-line', 'atmel,x-size',
    'atmel,y-line', 'atmel,y-size' do not match any of the regexes
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210506152044.37579-1-krzysztof.kozlowski@canonical.com

arch/arm/boot/dts/s5pv210-goni.dts

@@ -358,15 +358,6 @@ touchscreen@4a {
 		reg = <0x4a>;
 		interrupt-parent = <&gpj0>;
 		interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
-
-		atmel,x-line = <17>;
-		atmel,y-line = <11>;
-		atmel,x-size = <800>;
-		atmel,y-size = <480>;
-		atmel,burst-length = <0x21>;
-		atmel,threshold = <0x28>;
-		atmel,orientation = <1>;
-
 		vdd-supply = <&tsp_reg>;
 	};
 };