Adds a simple driver to access the 5x5 LED display found on BBC
micro:bit boards. The display is so limited that no effort is done to
try to integrate with the existing console (which would likely make
the display unusable). Instead, dedicated mb_display_* APIs are added
that are specific to this display.
References:
https://www.microbit.co.uk/device/screenhttps://lancaster-university.github.io/microbit-docs/ubit/display/
Jira: ZEP-1990
Change-Id: I431b5b358b5f07592a60d3aed87eaab6ac20ce25
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
