ARM: nomadik: register all three I2C busses

The Nomadik has two dedicated I2C bus blocks for I2C0 and I2C1,
and a bitbanged GPIO connection on two pins for the USB portions
of the STw4811 chip. Register all three as bit-banged GPIO for
the moment.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>