Fix camera2.cts.CameraManagerTest.testManagerGetDeviceIdList for TV.

TV Camera is defined as an EXTERNAL CAMERA, and the lensFacing is set LENS_FACING_EXTERNAL.
But CTS test case has not added the code to handle the external camera.
Change the CTS code to support external Camera.

Change-Id: I0ac0957e5589e5b056c6bcf0a47907dbb4fc05d4
diff --git a/tests/camera/src/android/hardware/camera2/cts/helpers/StaticMetadata.java b/tests/camera/src/android/hardware/camera2/cts/helpers/StaticMetadata.java
index e892e42..141bfac 100644
--- a/tests/camera/src/android/hardware/camera2/cts/helpers/StaticMetadata.java
+++ b/tests/camera/src/android/hardware/camera2/cts/helpers/StaticMetadata.java
@@ -2087,7 +2087,7 @@
 
         checkTrueForKey(key, " value is out of range ",
                 facing >= CameraCharacteristics.LENS_FACING_FRONT &&
-                facing <= CameraCharacteristics.LENS_FACING_BACK);
+                facing <= CameraCharacteristics.LENS_FACING_EXTERNAL);
         return facing;
     }