Add Root Robot identifier service UUID to enums list.

https://github.com/RootRobotics/root-robot-ble-protocol identifies this
device's Bluetooth identifier UUID used when scanning for devices.

Change-Id: Ie2f38e66308dd77e2206decff86204c1b09e0922
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327813
Auto-Submit: Vincent Scheib <scheib@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792928}

tools/metrics/histograms/enums.xml

@@ -31889,6 +31889,8 @@ Called by update_feature_policy_enum.py.-->
       label="PocketLab; f000aa32-0452-4000-b000-000000000000"/>
   <int value="252638028" label="fe9c"/>
   <int value="253001319" label="fe84"/>
+  <int value="265147461"
+      label="Root Robot; 48c5d828-ac2a-442d-97a3-0c9822b04979"/>
   <int value="267848299" label="fe3e"/>
   <int value="270670950" label="fe62"/>
   <int value="272049750"