First attempt to clean up SPI probing and create a common
construct: the flash bus.
At some point the flash bus will be part of struct flashchip.
Pardon me for pushing this in, but I think it is important to beware of further
decay and it will improve things for other developers in the short run.
Carl-Daniel, I will consider your suggestions in another patch. I want to keep
things from getting too much for now. The patch includes Rudolf's VIA SPI
Signed-off-by: Stefan Reinauer <email@example.com>
Acked-by: Carl-Daniel Hailfinger <firstname.lastname@example.org>