Default missing DevType and DevClass in NVRAM.

Missing DevType and DevClass in NVRAM were not properly set to a
default values previously.
diff --git a/btif/src/btif_storage.c b/btif/src/btif_storage.c
index a9e4c94..0fb1b91 100644
--- a/btif/src/btif_storage.c
+++ b/btif/src/btif_storage.c
@@ -871,7 +871,6 @@
     uint32_t disc_timeout;
     bt_uuid_t local_uuids[BT_MAX_NUM_UUIDS];
     bt_uuid_t remote_uuids[BT_MAX_NUM_UUIDS];
-    uint32_t cod, devtype;
 
     btif_in_fetch_bonded_devices(&bonded_devices, 1);
 
@@ -936,6 +935,12 @@
         {
             bt_bdaddr_t *p_remote_addr;
 
+            /*
+             * TODO: improve handling of missing fields in NVRAM.
+             */
+            uint32_t cod = 0;
+            uint32_t devtype = 0;
+
             num_props = 0;
             p_remote_addr = &bonded_devices.devices[i];
             memset(remote_properties, 0, sizeof(remote_properties));