Relocate AOSP car emulators

Move sdk_car_* makefiles from `device/generic/goldfish/car` to
`device/generic/car`.

Bug: 245417855
Test: build sdk_car_x86_64-userdebug
Merged-In: I955aa4e8cf30a6de51eb2c0444c7c13b87c9b341
Change-Id: I572f36dac202c3ba91137282ed614a0b1f2e484b
6 files changed