Revert "Add README with details about the status of support for ..." am: b456c8f716 am: 86f5465703

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Car/MessengerPrebuilt/+/3344334

Change-Id: I509ecdc93fe964c60dfb2a8c4639e0a49d0b7d84
Signed-off-by: Automerger Merge Worker <[email protected]>