chrontel: switch GPIO from 207 to 221

After switching to LPC_ICH/GPIO_ICH kernel driver from NM10_GPIO the base
address for GPIOs has changed.

BUG=chromium:491407
TEST=boot zgb-x86_freon with HDMI monitor attached
CQ-DEPEND=CL:293583

Change-Id: I8702bbf32ea23f54cac467c30352ef5adf410c36
Signed-off-by: Dominik Behr <dbehr@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/293574
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>