Add Automotive OS SDK API 29 stubs to prebuilts.

Artifact:
$ fetch_artifact --bid 6688370 --target hawk-userdebug \
    --branch qt-car-release "android.car-stubs.jar"

Bug: 154653660
Test: m -j
Change-Id: I307a66b352554b9b3b022f940cec8e4be41b9b1d
diff --git a/29/public/android.car.jar b/29/public/android.car.jar
new file mode 100644
index 0000000..6ccac07
--- /dev/null
+++ b/29/public/android.car.jar
Binary files differ