Initial OTG support for STM32H7 and some minor improvements
arch/arm/src/stm32h7/stm32h7x3xx_rcc.c: add support for HSI48 clock
configs/nucleo-f207zg: add support for USB and initialize CDCACM if configured
configs/nucleo-h743zi: add support for USB and initialize CDCACM if configured
drivers/usbdev/Kconfig: fix type for USBDEV_TRACE_INITIALIDSET
configs/teensy-3.x/usbnsh/defconfig: update config according to change in USBDEV_TRACE_INITIALIDSET
Approved-by: Gregory Nutt <gnutt@nuttx.org>
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()
configs/nucleo-f207zg, configs/nucleo-f103rb: add ADC and PWM examples; arch/arm/src/stm32_adc.c: there is no DMA CFG bit for the basic IPv1 ADC
Approved-by: GregoryN <gnutt@nuttx.org>