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()
sched/: Convert legitimate uses of task_create() to nxtask_create(). Review handling of returned values from all uses of kthread_create() (as well as nxtask_create()).
graphics/: Review return values for all calls to kthread_start() because it no longer returns an errno.
drivers/: threads started by drivers should be kernel threads, not user tasks. Review return values for all calls to kthread_start() because it no longer returns an errno.
configs/: threads started by board bringup logic should be kernel threads, not user tasksi (part 2 of 2).
sched/task: Add nxtask_create(). Kthread_create() and nxtask_create() are internal OS functions and should not modify the errno variable. configs/: threads started by board bringup logic should be kernel threads, not user tasks.
STM32, STM32 L4, and STM32 M4: USB OTGFS DMA trace output fix
STM32: Add dump buffer feature to stm32 F4 series
STM32 and STM32 L4: Fix bad USB OTGFS register address
STM32 L4: Fix typo in USB OTGFS register usage
STM32 L4: Add check in USB OTGFS driver to assure that SYSCFG is enabled
Nucleo-L496ZG: Make HSE on Nucleo-L496ZG default to enable USB