Update variants/STM32U5xx/U595Z(I-J)TxQ_U599Z(I-J)TxQ_U5A5ZJTxQ_U5A9ZJTxQ/generic_clock.c

Configure LPUART1 clock to be able to have 9600 available as suggested by @fpistm

Co-authored-by: Frederic Pillon <frederic.pillon@st.com>
Signed-off-by: patricklaf <patrick.lafarguette@gmail.com>

Author: patricklaf

variants/STM32U5xx/U595Z(I-J)TxQ_U599Z(I-J)TxQ_U5A5ZJTxQ_U5A9ZJTxQ/generic_clock.c

@@ -72,7 +72,8 @@ WEAK void SystemClock_Config(void)
     Error_Handler();
   }
   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADCDAC | RCC_PERIPHCLK_DAC1
-                                       | RCC_PERIPHCLK_CLK48;
+                                       | RCC_PERIPHCLK_CLK48 | RCC_PERIPHCLK_LPUART1;
+  PeriphClkInit.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_HSI;
   PeriphClkInit.AdcDacClockSelection = RCC_ADCDACCLKSOURCE_HSI;
   PeriphClkInit.Dac1ClockSelection = RCC_DAC1CLKSOURCE_LSI;
   PeriphClkInit.IclkClockSelection = RCC_CLK48CLKSOURCE_HSI48;