Merge "Retire the emulator_car_x86_64 board" into main am: 50a66823a2

Original change: https://android-review.googlesource.com/c/device/generic/car/+/2811138

Change-Id: I1c6f74dd7a27480c0dacd8d65023a2752983de71
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>