boards: nucleo_h753zi: Use dts for clocks configuration

Convert board to use of device tree for clocks configuration.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>

boards/arm/nucleo_h753zi/nucleo_h753zi.dts

@@ -58,6 +58,34 @@
 	};
 };
 
+
+&clk_hse {
+	hse-bypass;
+	clock-frequency = <DT_FREQ_M(8)>; /* STLink 8MHz clock */
+	status = "okay";
+};
+
+&pll {
+	div-m = <1>;
+	mul-n = <24>;
+	div-p = <2>;
+	div-q = <4>;
+	div-r = <2>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(96)>;
+	d1cpre = <1>;
+	hpre = <1>;
+	d1ppre = <1>;
+	d2ppre1 = <1>;
+	d2ppre2 = <1>;
+	d3ppre = <1>;
+};
+
 &usart3 {
 	pinctrl-0 = <&usart3_tx_pd8 &usart3_rx_pd9>;
 	current-speed = <115200>;

boards/arm/nucleo_h753zi/nucleo_h753zi_defconfig

@@ -2,8 +2,6 @@
 
 CONFIG_SOC_SERIES_STM32H7X=y
 CONFIG_SOC_STM32H753XX=y
-# 96MHz system clock (CubeMX Defaults)
-CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=96000000
 
 # Enable MPU
 CONFIG_ARM_MPU=y
@@ -24,21 +22,5 @@ CONFIG_PINMUX=y
 # Enable GPIO
 CONFIG_GPIO=y
 
-# Clock Configuration
+# Enable clocks
 CONFIG_CLOCK_CONTROL=y
-
-# STLINK provides 8MHz clock input
-CONFIG_CLOCK_STM32_HSE_CLOCK=8000000
-CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
-# Use HSE as PLL input
-CONFIG_CLOCK_STM32_PLL_SRC_HSE=y
-# Nucleo-144 boards do not have an external oscillator, so just use
-# the 8MHz clock signal coming from integrated STLink
-CONFIG_CLOCK_STM32_HSE_BYPASS=y
-
-# Produce 96MHz clock at PLL output
-CONFIG_CLOCK_STM32_PLL_M_DIVISOR=1
-CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER=24
-CONFIG_CLOCK_STM32_PLL_P_DIVISOR=2
-CONFIG_CLOCK_STM32_PLL_Q_DIVISOR=4
-CONFIG_CLOCK_STM32_PLL_R_DIVISOR=2