boards: st: stm32n6570_dk: Add IC17/IC18 settings for DCMIPP/CSI

Add configuration of the IC17 and IC18 clock dividers, used
by the dcmipp and csi IPs in the stm32n6.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Author: Alain Volmat

boards/st/stm32n6570_dk/stm32n6570_dk_common.dtsi

@@ -137,6 +137,18 @@
 	status = "okay";
 };
 
+&ic17 {
+	pll-src = <1>;
+	ic-div = <4>;
+	status = "okay";
+};
+
+&ic18 {
+	pll-src = <1>;
+	ic-div = <60>;
+	status = "okay";
+};
+
 &perck {
 	clocks = <&rcc STM32_SRC_HSI PER_SEL(0)>;
 	status = "okay";