Merge pull request #3391 from jeromecoutant/PR_ST_F4_ASSERT

STM32F4 : map ST HAL assert into MBED assert

Author: 0xc0170

targets/TARGET_STM/TARGET_STM32F4/TARGET_B96B_F446VE/device/stm32f4xx_hal_conf.h

@@ -808,6 +808,8 @@ void SystemClock_Config(void)
   RCC_OscInitStruct.PLL.PLLN = 336;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
   RCC_OscInitStruct.PLL.PLLQ = 7;
+  RCC_OscInitStruct.PLL.PLLR = 2;  // I2S clocks
+
   HAL_RCC_OscConfig(&RCC_OscInitStruct);
 
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
@@ -843,6 +845,8 @@ void SystemClock_Config(void)
   RCC_OscInitStruct.PLL.PLLN = 360;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
   RCC_OscInitStruct.PLL.PLLQ = 7;
+  RCC_OscInitStruct.PLL.PLLR = 2;  // I2S clocks
+
   HAL_RCC_OscConfig(&RCC_OscInitStruct);
 
   HAL_PWREx_ActivateOverDrive();