[manifest-test] Pin to CPU 0

We don't programmatically check that the test actually runs on CPU 0.
But this will at least check that pinning a core isn't completely
broken.

Bug: 178747469
Change-Id: I22e22bdb77e8478bfb46bcc9c355d982d96c08dc
diff --git a/manifest-test/manifest.json b/manifest-test/manifest.json
index 8208f99..24743e6 100644
--- a/manifest-test/manifest.json
+++ b/manifest-test/manifest.json
@@ -19,5 +19,6 @@
             "addr": "0x70020000",
             "size": "0x4"
         }
-    ]
+    ],
+    "pinned_cpu": 0
 }