simplify default setting

Author: JojoS62

targets/TARGET_STM/mbed_overrides.c

@@ -35,15 +35,11 @@ extern void SetSysClock(void);
 #if MBED_CONF_TARGET_LSE_AVAILABLE
 
 // set defaults for LSE drive load level, with exception for F4_g2 MCU
-#ifdef RCC_LSE_HIGHDRIVE_MODE
-#   if MBED_CONF_TARGET_LSE_DRIVE_LOAD_LEVEL
-#       define LSE_DRIVE_LOAD_LEVEL    MBED_CONF_TARGET_LSE_DRIVE_LOAD_LEVEL
-#   else
-#       define LSE_DRIVE_LOAD_LEVEL    RCC_LSE_HIGHDRIVE_MODE
-#   endif
+#if MBED_CONF_TARGET_LSE_DRIVE_LOAD_LEVEL
+#   define LSE_DRIVE_LOAD_LEVEL    MBED_CONF_TARGET_LSE_DRIVE_LOAD_LEVEL
 #else
-#   if MBED_CONF_TARGET_LSE_DRIVE_LOAD_LEVEL
-#       define LSE_DRIVE_LOAD_LEVEL    MBED_CONF_TARGET_LSE_DRIVE_LOAD_LEVEL
+#   ifdef RCC_LSE_HIGHDRIVE_MODE
+#       define LSE_DRIVE_LOAD_LEVEL    RCC_LSE_HIGHDRIVE_MODE
 #   else
 #       define LSE_DRIVE_LOAD_LEVEL    RCC_LSEDRIVE_MEDIUMHIGH
 #   endif