Add 9971 extrinsics

The camera on pi4 hasn't had its intrinsics calibrated yet, but put in a
placeholder.

Change-Id: I1e2e3d6a88dc3168f34ef349a09d82a84fdaba60
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/y2023/constants/BUILD b/y2023/constants/BUILD
index 9f8d1a4..09e57c7 100644
--- a/y2023/constants/BUILD
+++ b/y2023/constants/BUILD
@@ -21,6 +21,7 @@
     includes = [
         "7971.json",
         "971.json",
+        "9971.json",
         "//y2023/vision/calib_files",
         "//y2023/vision/maps",
     ],