pinctrl: cannonlake: Fix gpio base for GPP-E

The gpio base for GPP-E was set incorrectly to 258 instead of 256,
preventing the touchpad working on my Tong Fang GK5CN5Z laptop.

Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=200787


Signed-off-by: Simon Detheridge <s@sd.ai>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>