I have Android Things OS image installed for my Rasp3 and successfully booted up and log in to shell using adb, but lcd display is upside down with my 7 inch touchscreen display.
I wonder if there is config like lcd_rotate=2 in /boot/config.txt on Raspbian?
You can try to manually mount the boot partition from the sdcard and edit config.txt
mount -t msdos /dev/sdX1 /mnt/disk
echo 'lcd_rotate=2' >> /mnt/disk/config.txt
Where /dev/sdX1 points to your sdcard reader device.
Note: This is more a hack than an officially supported solution, you will have to re-do that operation everytime you upgrade the OS image. It'd be nice to file a feature request to ask for better support for (dynamic?) display configuration