adds import to st7789 driver

Author: kdschlosser

api_drivers/common_api_drivers/display/st7789/st7789.py

@@ -1,6 +1,7 @@
 from micropython import const  # NOQA
 import display_driver_framework
 import lcd_bus
+import lvgl as lv
 
 
 STATE_HIGH = display_driver_framework.STATE_HIGH