ARM: dts: stm32: YAML validation fails for Argon Boards

"make dtbs_check" gives following output :
stm32mp157c-emstamp-argon.dtb: gpu@59000000: 'contiguous-area' does not match
any of the regexes: 'pinctrl-[0-9]+'
From schema: Documentation/devicetree/bindings/gpu/vivante,gc.yaml

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: titolini72

arch/arm/boot/dts/stm32mp157c-emstamp-argon.dtsi

@@ -68,11 +68,6 @@
 			reg = <0x38000000 0x10000>;
 			no-map;
 		};
-
-		gpu_reserved: gpu@dc000000 {
-			reg = <0xdc000000 0x4000000>;
-			no-map;
-		};
 	};
 
 	led: gpio_leds {
@@ -183,10 +178,6 @@
 	};
 };
 
-&gpu {
-	contiguous-area = <&gpu_reserved>;
-};
-
 &hash1 {
 	status = "okay";
 };