Merge pull request #4422 from jeromecoutant/PR_F4_HSE_TIMEOUT

STM32F4 set HSE timeout value to 100ms

Author: theotherjimmy

targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_conf.h

@@ -108,7 +108,7 @@
 #endif /* HSE_VALUE */
 
 #if !defined  (HSE_STARTUP_TIMEOUT)
-  #define HSE_STARTUP_TIMEOUT    ((uint32_t)5000U)   /*!< Time out for HSE start up, in ms */
+  #define HSE_STARTUP_TIMEOUT    100U      /*!< Time out for HSE start up, in ms */
 #endif /* HSE_STARTUP_TIMEOUT */
 
 /**