ite: Add support for ITE81302-512 variant
ite: Add support for ITE81302-512 variant

Add support for 512Kb version of ITE81302BX.
Required for rework of drawlat to support Nereid zephyr support.

BUG=b:204231736
TEST=make -j buildall
BRANCH=none

Change-Id: I54b3fe0957c0f20a711682e380ef83b95d26a2b3
Signed-off-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3276025
Reviewed-by: Peter Marheine <ef0b2c492edde94778d7465bfbaeed52c5be6858@chromium.org>

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