Add updater tool for rr prebuilts. am: b6fd073329 am: 46d5e1335b

Original change: https://android-review.googlesource.com/c/platform/tools/rr_prebuilt/+/2749093

Change-Id: I7fc817c15cbb5bc3c179864781d4cae3f39e96bb
Signed-off-by: Automerger Merge Worker <[email protected]>