ARM: ux500: 8500: update I2C sleep states pinctrl

This defines the proper sleep states for all the I2C pins of
the MOP500 DB8500 ASIC setting.

Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Patrice Chotard <patrice.chotard@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>