feat(bigtableadmin): update the api

#### bigtableadmin:v2

The following keys were added:
- resources.projects.resources.instances.resources.materializedViews.methods.getIamPolicy (Total Keys: 12)
- resources.projects.resources.instances.resources.materializedViews.methods.setIamPolicy (Total Keys: 12)
- resources.projects.resources.instances.resources.materializedViews.methods.testIamPermissions (Total Keys: 12)

Author: yoshi-automation

docs/dyn/bigtableadmin_v2.projects.instances.html

@@ -84,6 +84,11 @@ <h2>Instance Methods</h2>
 </p>
 <p class="firstline">Returns the clusters Resource.</p>
 
+<p class="toc_element">
+  <code><a href="bigtableadmin_v2.projects.instances.materializedViews.html">materializedViews()</a></code>
+</p>
+<p class="firstline">Returns the materializedViews Resource.</p>
+
 <p class="toc_element">
   <code><a href="bigtableadmin_v2.projects.instances.tables.html">tables()</a></code>
 </p>