spotbugs: Exclude gradle generated view binding classes

Spot bugs complains about EI_EXPOSE_REP and BC_UNCONFIRMED_CAST bugs in these
classes but they are being generated by Gradle and are out of our control if
we want to use view binding to interact with the views.

Ref: https://developer.android.com/topic/libraries/view-binding

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/config/spotbugs/exclude.xml

@@ -6,5 +6,8 @@
     <Match>
         <Class name="~.*Manifest\$.*"/>
     </Match>
+    <Match>
+        <Class name="~.*Binding" />
+    </Match>
 
 </FindBugsFilter>