Rebase private OTA libs on 2.7

libs/ota-http-client/mjs_fs/api_ota.js

@@ -0,0 +1,6 @@
+let OTA = {
+  // ## **`OTA.evdataOtaStatusMsg(evdata)`**
+  // Getter function for the `evdata` given to the event callback for the event
+  // `Event.OTA_STATUS`, see `Event.addHandler()` in `api_events.js`.
+  evdataOtaStatusMsg: ffi('char *mgos_ota_status_get_msg(void *)'),
+};