Enabling adb on Beaglebone Black
Neither of the vendor IDs you've added to the udev rules file correspond to a device listed by lsusb. Other sources on the net suggest that the correct device ID is SYSFS{idVendor}=="1d6b", SYSFS{idProduct}="0104", but this device doesn't appear in your lsusb output either. Run lsusb with the device unplugged and plugged in to find which device is the right one, and edit your udev rules appropriately.

To confirm: you don't want to connect to the serial debugging port to get adb to work.