Camera2: Add test for construct_default_request.

Bug: 6243944
Change-Id: I59b03d7ebece2a4b7672b265bd9f960b3faea621
diff --git a/include/hardware/camera2.h b/include/hardware/camera2.h
index 7f06c52..0764cb1 100644
--- a/include/hardware/camera2.h
+++ b/include/hardware/camera2.h
@@ -400,7 +400,10 @@
      * full-resolution images without compromising preview frame rate. 3A on
      * auto.
      */
-    CAMERA2_TEMPLATE_ZERO_SHUTTER_LAG
+    CAMERA2_TEMPLATE_ZERO_SHUTTER_LAG,
+
+    /* Total number of templates */
+    CAMERA2_TEMPLATE_COUNT
 };