[PATCH]: dms init all 'dlna_dms_t' variables

dlna_init has not to set dms variables. It's dlna_dms_init which has to set them.
If dlna library has to manage DMP, it's useless to manage DMS
[PATCH]: dms uninit manages dlna_dms_t variables

All dlna_dms_t variables has to be uninit by dlna_dms_uninit function.
For DMP is useless to unset DMS information
[PATCH]: set the VFS storage type by default

The default VFS storage is set only the dms variable. But dms_set_memory can do more in the future