BCM36xx support.

[Rogier Wolff <R.E.Wolff@BitWizard.nl>]

While working on SPI and I2C support for the BCM2835, I found the
BCM63xx SPI driver in the kernel. Turns out that this support
was partially merged: 

The support can only be enabled when BCM63xx configuration symbol
is defined which menuconfig lists as: 

 Symbol: BCM63XX [=BCM63XX]                                                
   Type  : unknown                                                           

I'd say the definition of this is not possible through the normal
channels.

And in the driver (drivers/spi/spi-bcm63xx.c) I see: 

#include <bcm63xx_dev_spi.h>

but that file is not in the current git release.

(some more googling has resulted in me finding out that I don't want
to know how the 63xx SPI controller works as it's for a MIPS processor
while the 2835 is ARM).

Roger.

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