sched/init/nx_start.c: Add support for CONFIG_BOARD_DRIVER_INITIALIZE. If this option is selected then nx_start() will call a board-provided function board_driver_initialize() immediately after calling up_initialize().
Rename CONFIG_BOARD_INITIALIZE to CONFIG_BOARD_LATE_INITIALIZE.
Raname board_initialize() to board_late_initialize()
Squashed commit of the following:
libnx: Need to duplicate some Kconfig setting for NXFONTs if it can be configured and built independently of NX. Also includes some build-related fixes.
configs/sim: Disable NX graphics support in the fb configuration.
libnx: Basic configuration and build changes to support building font support independend of the NX server.
