Latest GCP kernel has Android related config options disabled

In LP:1849493 we enabled support for CONFIG_ANDROID_* on the gcp kernels to support Anbox Cloud. However checking on the latest rolling kernel on GCP (5.8.0-1038-gcp #40~20.04.1-Ubuntu ) gives

morphis@anbox0:~$ cat /boot/config-5.8.0-1038-gcp | grep CONFIG_AND
# CONFIG_ANDROID is not set

This is a regression and already affects customers of Anbox Cloud which intend to deploy on GCP and currently fail as the binder and ashmem kernel modules are missing. From the git history I wasn't able to figure out where the options got dropped.

The following options are what we need

CONFIG_ANDROID=y
CONFIG_ANDROID_BINDER_IPC=m
CONFIG_ANDROID_BINDERFS=m
CONFIG_ANDROID_BINDER_DEVICES=""
# CONFIG_ANDROID_BINDER_IPC_SELFTEST is not set
CONFIG_ASHMEM=m

These options should be set by default in all our cloud kernels, regardless which Ubuntu version.

Can we get some regression testing in place for this too?

Thanks!