i2c-nomadik: make i2c timeout specific per i2c bus

Add option to have different i2c timeout delay for different i2c buses
specified in platform data. Default to the old value unless specified.

Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>