fix: Nucleo_H743ZI: clock configuration

- Remove wrong PeriphClkInitStruct.PeriphClockSelection
- Fix LPUART1 clock selection to match requirement

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

variants/STM32H7xx/H742Z(G-I)T_H743Z(G-I)T_H747A(G-I)I_H747I(G-I)T_H750ZBT_H753ZIT_H757AII_H757IIT/variant_NUCLEO_H743ZI.cpp

@@ -364,7 +364,6 @@ WEAK void SystemClock_Config(void)
                                              | RCC_PERIPHCLK_USART234578 | RCC_PERIPHCLK_I2C123
                                              | RCC_PERIPHCLK_I2C4 | RCC_PERIPHCLK_SPI123
                                              | RCC_PERIPHCLK_SPI45 | RCC_PERIPHCLK_SPI6;
-  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
   PeriphClkInitStruct.PLL2.PLL2M = 1;
   PeriphClkInitStruct.PLL2.PLL2N = 20;
   PeriphClkInitStruct.PLL2.PLL2P = 2;
@@ -373,11 +372,19 @@ WEAK void SystemClock_Config(void)
   PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_3;
   PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOMEDIUM;
   PeriphClkInitStruct.PLL2.PLL2FRACN = 0.0;
+  PeriphClkInitStruct.PLL3.PLL3M = 1;
+  PeriphClkInitStruct.PLL3.PLL3N = 24;
+  PeriphClkInitStruct.PLL3.PLL3P = 2;
+  PeriphClkInitStruct.PLL3.PLL3Q = 6;
+  PeriphClkInitStruct.PLL3.PLL3R = 2;
+  PeriphClkInitStruct.PLL3.PLL3RGE = RCC_PLL3VCIRANGE_3;
+  PeriphClkInitStruct.PLL3.PLL3VCOSEL = RCC_PLL3VCOWIDE;
+  PeriphClkInitStruct.PLL3.PLL3FRACN = 0.0;
   PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL2;
   PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
   PeriphClkInitStruct.QspiClockSelection = RCC_QSPICLKSOURCE_D1HCLK;
   PeriphClkInitStruct.SdmmcClockSelection = RCC_SDMMCCLKSOURCE_PLL;
-  PeriphClkInitStruct.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_D3PCLK1;
+  PeriphClkInitStruct.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_PLL3;
   PeriphClkInitStruct.Usart16ClockSelection = RCC_USART16CLKSOURCE_D2PCLK2;
   PeriphClkInitStruct.Usart234578ClockSelection = RCC_USART234578CLKSOURCE_D2PCLK1;
   PeriphClkInitStruct.I2c123ClockSelection = RCC_I2C123CLKSOURCE_D2PCLK1;