Separate CMD_FASTBOOT from FASTBOOT and move code and configuration to
drivers/fastboot.

Switch dependencies on FASTBOOT to USB_FUNCTION_FASTBOOT as anyone who wants
FASTBOOT before this series wants USB_FUNCTION_FASTBOOT. Split
USB_FUNCTION_FASTBOOT from FASTBOOT so they retain their existing
behaviour.
Signed-off-by: NAlex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Acked-by: NJoe Hershberger <joe.hershberger@ni.com>