zephyr: it8xxx2_evb: Add pinctrl-0 property setting
zephyr: it8xxx2_evb: Add pinctrl-0 property setting

The pinctrl driver has been added, so we need to add pinctrl-0
alternate function settings to each driver node.

For the I2C related GPIO setting, we can add the property to the
&pinctrl node. So remove the I2C related gpios=<...>.

BUG=none
BRANCH=none
TEST=zmake build it8xxx2_evb --clobber
     Make sure these pins have been set as alternate function.

Signed-off-by: Tim Lin <38846f7070d5770410e9ef8b439c72e7b53a72c5@ite.corp-partner.google.com>
Change-Id: I8236c33aa38681019a3518619f2bfedf54b6f981
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3577329
Reviewed-by: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>
Commit-Queue: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Tested-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Reviewed-by: Yuval Peress <50dc11c009bd4d7e9d9d15a383c1743ce5ee82ef@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec