Add method to get id of virtual camera

Also, add CtsVirtualDevicesCameraTestCases to virtualcamera
service postsubmit.

Test: atest CtsVirtualDevicesCameraTestCases
Bug: 310857519
Change-Id: I9f2e070a49bbf94694e996e4793a7997fbcb7b9e
diff --git a/services/camera/virtualcamera/TEST_MAPPING b/services/camera/virtualcamera/TEST_MAPPING
index 04b4025..10ba61a 100644
--- a/services/camera/virtualcamera/TEST_MAPPING
+++ b/services/camera/virtualcamera/TEST_MAPPING
@@ -2,6 +2,14 @@
   "postsubmit": [
     {
       "name": "virtual_camera_tests"
+    },
+    {
+      "name": "CtsVirtualDevicesCameraTestCases",
+      "options": [
+        {
+          "exclude-annotation": "androidx.test.filters.FlakyTest"
+        }
+      ]
     }
   ]
 }