PCA9564-platform driver

This is a series to add a platform driver for the PCA9564. For this, I needed
to extend the pca-algorithm a bit. I tried to adapt the existing ISA-driver
to the extensions, but cannot test it. The original maintainer receives
a cc. I developed it using a Blackfin based board. This driver should
be able to handle multiple instances (unlike the ISA one), but again
I could not test this feature myself.

I am looking forward to feedback! Thanks in advance.

-- 
  Dipl.-Ing. Wolfram Sang | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry

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