stmhal: Enable I & D caches for M7

stmhal/system_stm32.c

@@ -316,3 +316,13 @@ void SystemClock_Config(void)
   RCC->DCKCFGR2 = 0;
 #endif
 }
+
+void HAL_MspInit(void) {
+#if defined(MCU_SERIES_F7)
+    /* Enable I-Cache */
+    SCB_EnableICache();
+
+    /* Enable D-Cache */
+    SCB_EnableDCache();
+#endif
+}