Update data option for components using Mixin data

- Removed all the data options from all the mixins.
- Updated component data property relying on data property defined in
  mixin.
- Export data property from mixin file itself.

Signed-off-by: Suren Neware <sneware9@in.ibm.com>
Change-Id: I4aeffcb333bbaf5b78bcadd711b3169b0b4cb10e
diff --git a/src/components/Mixins/LoadingBarMixin.js b/src/components/Mixins/LoadingBarMixin.js
index bb3e796..d115270 100644
--- a/src/components/Mixins/LoadingBarMixin.js
+++ b/src/components/Mixins/LoadingBarMixin.js
@@ -1,9 +1,6 @@
+export const loading = true;
+
 const LoadingBarMixin = {
-  data() {
-    return {
-      loading: true,
-    };
-  },
   methods: {
     startLoader() {
       this.$root.$emit('loader-start');