zephyr: craask: add GPIO_VOLTAGE_1P8 flag support
zephyr: craask: add GPIO_VOLTAGE_1P8 flag support

Add GPIO_VOLTAGE_1P8 flag support at the related board DT file and
remove unused def-lvol-io-list node.

BRANCH=none
BUG=b:239636081
TEST=Passed 'zmake build craask --clobber'

Signed-off-by: Mulin Chao <6bbc5af053a1dfdc363be6857f30de4ac3bcbd16@nuvoton.com>
Cq-Depend: chromium:3782768, chromium:3782769, chromium:3782770
Change-Id: Ib57a17e73ba5de19c36b12d06ade04898da9a4a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3775792
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Reviewed-by: Fabio Baltieri <1c55e39c05d9ab42261288cf330256b2af6ba179@google.com>
Commit-Queue: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

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