upcoming change to iicbb

[Andriy Gapon]

If you are using the I²C bit-banging driver (iicbb) in any form (e.g., via
gpioiic) you could be interested in a change that I am planning to commit very
soon: https://reviews.freebsd.org/D22206
This is quite a big change to the bit-banging is done.  Its goals are to improve
speeds and robustness.

I will appreciate any reviews, testing or other feedback.
Thank you.
-- 
Andriy Gapon