According to Google, cars that launch with Android Automotive OS 13 on top of Linux 5.15 or later are required to meet GKI 1.0 requirements. Android TV is now the only remaining Android platform where GKI is not enforced, it seems.
“Enable GKI test for automotive devices
We’ve mandated GKI 1.0 requirements for automotive devices since Android T, as shown in this link: https://docs.partner.android.com/gas/requirements/software/3.0”
(Note: The above URL is only accessible to Android Partners.)
GKI 1.0 was introduced in Android 11 for devices that launched with Linux 5.4.
GKI 2.0 was introduced in Android 12 for devices that ship with Linux 5.10 or later kernels.
The biggest difference between GKI 1.0 and 2.0 is that 2.0 devices ship with a Google-signed boot image.
The Vendor Test Suite (VTS) test that checks for GKI compliance previously skipped devices that declare android.software.leanback (Android TV & Google TV) or android.hardware.type.automotive (AAOS). Now it only skips running on TV (as well as non-ARM64 kernels).