gpio: ich: set regs and reglen for i3100 and ich6 chipset

This patch fixes kernel NULL pointer BUG introduced by the following commit:
b667cf48


gpio: ich: Add support for multiple register addresses.

Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com>
Tested-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>