The header was missing the language linkage wrapper that allows the
driver-specific function to be located from C++.
Also it helps the poor user to be informed that the function is only
available when a special Kconfig option is set.
Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This is called when the USB host changes the virtual baud rate.
This is used by Arduino style boards to signal that the board should
reset into the bootloader.
Signed-off-by: Michael Hope <mlhx@google.com>