Use emu64*/device.mk instead of emulator64*/device.mk am: 28d190d96f am: 462a454c10

Original change: https://android-review.googlesource.com/c/device/generic/car/+/2804833

Change-Id: I84b3b76f72538a95496925db1f925abe597f0de9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>