Camera: Add CTS into postsubmit for key camera directories

Run postsubmit on cuttlefish and the primary physical device currently available.

Bug: 158797957
Test: atest :postsubmit correctly tries to run CtsCameraTestCases
Change-Id: I1e5367c39c37f4168e4cc5a8d28ac4d9822d3581
diff --git a/camera/TEST_MAPPING b/camera/TEST_MAPPING
new file mode 100644
index 0000000..683e183
--- /dev/null
+++ b/camera/TEST_MAPPING
@@ -0,0 +1,11 @@
+{
+  "postsubmit": [
+    {
+      "name": "CtsCameraTestCases"
+    },
+    {
+      "name": "CtsCameraTestCases",
+      "keywords": ["primary-device"]
+    }
+  ]
+}