arm64: dts: st: Adjust interrupt-controller for stm32mp21 SoCs

Use gic-400 compatible for aarch64

Fixes: 7a57b1b ("arm64: dts: st: introduce stm32mp21 SoCs family")
Signed-off-by: Christian Bruel <christian.bruel@foss.st.com>
Link: https://lore.kernel.org/r/20250415111654.2103767-4-christian.bruel@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: Christian Bruel

arch/arm64/boot/dts/st/stm32mp211.dtsi

@@ -116,7 +116,7 @@
 		};
 
 		intc: interrupt-controller@4ac10000 {
-			compatible = "arm,cortex-a7-gic";
+			compatible = "arm,gic-400";
 			reg = <0x4ac10000 0x0 0x1000>,
 			      <0x4ac20000 0x0 0x2000>,
 			      <0x4ac40000 0x0 0x2000>,