Rename all /orin2 camera channels to /imu

This makes things more internall consistent.

Change-Id: Ia1dfcf6bde96874dae518a72b5c671cae8eb7fe5
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/y2024/localizer/localizer.cc b/y2024/localizer/localizer.cc
index 34c0bc7..441360c 100644
--- a/y2024/localizer/localizer.cc
+++ b/y2024/localizer/localizer.cc
@@ -34,8 +34,8 @@
 namespace y2024::localizer {
 namespace {
 constexpr std::array<std::string_view, Localizer::kNumCameras>
-    kDetectionChannels{"/orin1/camera0", "/orin1/camera1", "/orin2/camera0",
-                       "/orin2/camera1"};
+    kDetectionChannels{"/orin1/camera0", "/orin1/camera1", "/imu/camera0",
+                       "/imu/camera1"};
 
 size_t CameraIndexForName(std::string_view name) {
   for (size_t index = 0; index < kDetectionChannels.size(); ++index) {