ARM: ux500: configure for CW1200 WLAN chip

The CW1200 WLAN chip driver had been in the kernel for a while,
we only need to activate it for the Ux500 properly. The latter
require some elaborative work, but in the meantime, let's make
sure we atleast compile it in.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>