Correct compilation issue

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_DRAGONFLY_F411RE/device/system_stm32f4xx.c

@@ -159,7 +159,7 @@
   */
 uint32_t SystemCoreClock = 16000000;
 const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
-
+const uint8_t APBPrescTable[8]  = {0, 0, 0, 0, 1, 2, 3, 4};
 /**
   * @}
   */

targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_MDOT_F405RG/device/system_stm32f4xx.c

@@ -138,7 +138,7 @@
   */
   uint32_t SystemCoreClock = 48000000;
 const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
-
+const uint8_t APBPrescTable[8]  = {0, 0, 0, 0, 1, 2, 3, 4};
 /**
   * @}
   */

targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_MDOT_F411RE/device/system_stm32f4xx.c

@@ -164,7 +164,7 @@
   */
 uint32_t SystemCoreClock = 16000000;
 const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
-
+const uint8_t APBPrescTable[8]  = {0, 0, 0, 0, 1, 2, 3, 4};
 /**
   * @}
   */