Backhaul STA Radio Capabilities (map-controller)

Implementing the Backhaul STA Radio Capabilities cmdu from Section 9.3 of easymesh R2.

src/core/cntlr_cmdu_generator.c

@@ -402,6 +402,29 @@ fail_cmdu:
 	return NULL;
 }
 
+struct cmdu_cstruct *cntlr_gen_bk_caps_query(struct controller *c,
+		uint8_t *origin, char *intf_name)
+{
+	struct cmdu_cstruct *cmdu;
+
+	cmdu = calloc(1, sizeof(struct cmdu_cstruct));
+	if (!cmdu) {
+		fprintf(stderr, "failed to malloc cmdu\n");
+		return NULL;
+	}
+
+	cmdu_defaults(c, cmdu, origin, intf_name,
+			CMDU_BACKHAUL_STA_CAPABILITY_QUERY);
+
+	cmdu->num_tlvs = 0;
+
+	return cmdu;
+
+fail_cmdu:
+	map_free_cmdu(cmdu);
+	return NULL;
+}
+
 struct cmdu_cstruct *cntlr_gen_ap_autoconfig_search(struct controller *c,
 		char *intf_name, uint8_t profile, uint8_t band)
 {