arduino-nano-33-ble: enable Adafruit TFT 2.8 display support

This adds a minimal set of changes required to support the 2.8 TFT display
from Adafruit. These changes are not what went upstream as Zephyr v3.1
introduced a new virtual connector for the nano form factor that we don't
have yet in v3.0.

This allows us to build the lvgl sample for Arduino Nano 33 BLE.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@huawei.com>