topology: Store number of strings of a text section

Enum controls may use text elements and need the number of strings.

This patch adds a text child object for a generic element. When parsing
a text section from the configuation file, store the text strings and
number of strings (num_items) in the text child object of the element.

Reported-by: G Kranthi <gudishax.kranthikumar@intel.com>
Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

src/topology/elem.c

@@ -159,6 +159,7 @@ struct tplg_elem* tplg_elem_new_common(snd_tplg_t *tplg,
 		break;
 	case SND_TPLG_TYPE_TEXT:
 		list_add_tail(&elem->list, &tplg->text_list);
+		obj_size = sizeof(struct tplg_texts);
 		break;
 	case SND_TPLG_TYPE_TLV:
 		list_add_tail(&elem->list, &tplg->tlv_list);