mach-ux500: remove pull-pinconfig and add SPI2

Remove PIN_CFG_PULL in pincfg.h for plat-nomadik, PIN_CFG_INPUT
already takes care of this. Added support for SPI2.

Signed-off-by: Fredrik Svensson <fredrik.xk.svensson@stericsson.com>
Signed-off-by: Daniel Willerud <daniel.willerud@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>