fix: Change the vmlist attribute from array to pointer

Pedantic C does not allow for the initialization of flexible array members.
The presented solution follows the same pattern as other attributes in structs
used in the configuration (e.g., shmemlist or regions).

Signed-off-by: Miguel Silva <[email protected]>

src/core/inc/config.h

@@ -118,7 +118,7 @@ extern struct config {
     size_t vmlist_size;
 
     /* Array list with VM configuration */
-    struct vm_config vmlist[];
+    struct vm_config* vmlist;
 
 } config;