ARM: STi: DT: STiH415: Remove unused CLK_S_ICN_REG_0 fixed clock

CLK_S_ICN_REG_0 clock is no longer used.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

arch/arm/boot/dts/stih415-clock.dtsi

@@ -32,16 +32,6 @@ arm_periph_clk: arm_periph_clk {
 			clock-frequency = <500000000>;
 		};
 
-		/*
-		 * Bootloader initialized system infrastructure clock for
-		 * serial devices.
-		 */
-		CLKS_ICN_REG_0: CLKS_ICN_REG_0 {
-			#clock-cells = <0>;
-			compatible = "fixed-clock";
-			clock-frequency = <100000000>;
-		};
-
 		CLKS_GMAC0_PHY: clockgenA1@7 {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";