ARM: ux500: 8500: update SKE keypad pinctrl table

The old pinctrl table for the SKE keypad was using all the
wrong settings and positions. Fixing it up to one that works!

Signed-off-by: Patrice Chotard <patrice.chotard@stericsson.com&gt;nn>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>