boards: twr-kv58f220m: add support for the NXP TWR-KV58F220M board

Add support for the NXP TWR-KV58F220M development board. This board
features an NXP MKV58F24 MCU, four user LEDs and four buttons,
potentiometer, two TWRPI headers, and a motor control header.

Signed-off-by: Filip Brozovic <fbrozovic@gmail.com>