Differentiate kernel driver based on TARGET_USE_PANFROST
Currently the kernel is just recompiled with panfrost enabled. Come up with a way to parameterise based on TARGET_USE_PANFROST
possible solutions:
- use modules (if aosp allows) and add init.rc snippets to load the relevant module
- include both drivers in the kernel but blacklist the driver we don't want to use via the kernel cmdline
- is there any problem in keeping both enabled in the kernel? How can we ensure panfrost is selected as the controlling driver based on TARGET_USE_PANFROST?