Add function for remapping a ChipIO stream's ports. Also include some
documentation as to how this works.
Signed-off-by: Connor McAdams <conmanx360@gmail.com>
Link: https://lore.kernel.org/r/20201210160658.461739-3-conmanx360@gmail.comSigned-off-by: Takashi Iwai <tiwai@suse.de>