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:
Author: Gregory Nutt <gnutt@nuttx.org>
Many small changes related to coding style.
Author: Petro Karashchenko <petro.karashchenko@gmail.com>
configs/beaglebone-black: Adds initial support for the BeagleBone Black board.
arch/arm/src/am335x: Adds initial support for the TI AM355x family.