Camera: Mark camera HAL device v2.x as unsupported

Device HAL v2.x is obsolete, and no devices using it are still
supported. Mark it unsupported, and clean up native tests.

Bug: 25866588
Change-Id: I8e0f1448b8ae0eaaf3714f2351746af46c7657a7
diff --git a/include/hardware/camera2.h b/include/hardware/camera2.h
index d920d4b..2b7add0 100644
--- a/include/hardware/camera2.h
+++ b/include/hardware/camera2.h
@@ -23,7 +23,10 @@
 /**
  * Camera device HAL 2.1 [ CAMERA_DEVICE_API_VERSION_2_0, CAMERA_DEVICE_API_VERSION_2_1 ]
  *
- * DEPRECATED. New devices should use Camera HAL v3.2 or newer.
+ * NO LONGER SUPPORTED.  The camera service will no longer load HAL modules that
+ * contain HAL v2.0 or v2.1 devices.
+ *
+ * New devices should use Camera HAL v3.2 or newer.
  *
  * Supports the android.hardware.Camera API, and the android.hardware.camera2
  * API in legacy mode only.