drivers: mb_display: rework bbc:microbit display support

Rework bbc:microbit display support to use nRF LED matrix
display controller driver and allow to use it with
bbc:microbit v2 board.

This patch turns the driver into a higher level driver
using the display controller API. Code that directly
accesses hardware (GPIO) is removed.
This driver is reworked to be more generic. It still
has a lot of potential for improvement, but it requires
changes in all applications that use this tool.

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

drivers/display/Kconfig.microbit

@@ -5,9 +5,8 @@
 
 config MICROBIT_DISPLAY
 	bool "BBC micro:bit 5x5 LED Display support"
-	depends on BOARD_BBC_MICROBIT
+	depends on BOARD_BBC_MICROBIT || BOARD_BBC_MICROBIT_V2
 	depends on PRINTK
-	depends on GPIO
 	help
 	  Enable this to be able to display images and text on the 5x5
 	  LED matrix display on the BBC micro:bit.