Merge "Retire the emulator_car_x86_64 board" into main am: 50a66823a2 am: 18fc02b2c8 am: 1136084a66

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

Change-Id: I736a57c3b30d4b6c21eb3d77488c10c1fe0a27f5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>