asurada: build.mk: change chip variant to it81202ax
asurada: build.mk: change chip variant to it81202ax

BUG=None
BRANCH=none
TEST=make BOARD=asurada -j

Signed-off-by: tim <38846f7070d5770410e9ef8b439c72e7b53a72c5@ite.corp-partner.google.com>
Change-Id: I2dbd2dcb03f3624f67edb6aaeaf6eb8024dbc210
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2137179
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

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