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/BVTableSelectableMixin.js b/src/components/Mixins/BVTableSelectableMixin.js
index cee7d0c..d41ed22 100644
--- a/src/components/Mixins/BVTableSelectableMixin.js
+++ b/src/components/Mixins/BVTableSelectableMixin.js
@@ -1,11 +1,8 @@
+export const selectedRows = [];
+export const tableHeaderCheckboxModel = false;
+export const tableHeaderCheckboxIndeterminate = false;
+
 const BVTableSelectableMixin = {
-  data() {
-    return {
-      tableHeaderCheckboxModel: false,
-      tableHeaderCheckboxIndeterminate: false,
-      selectedRows: [],
-    };
-  },
   methods: {
     clearSelectedRows(tableRef) {
       if (tableRef) tableRef.clearSelected();