DragonEgg: Change CHIP_VARIANT to it8320dx
DragonEgg: Change CHIP_VARIANT to it8320dx

To apply IT8320DX setting on DragonEgg board.

BUG=none
BRANCH=none
TEST=make buildall

Change-Id: I5a22a747f4431f2a8b17dcefca973375744ea2e4
Signed-off-by: Dino Li <338d523ecf3700bd86eb9c34d220f91911d2a18c@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/1133078
Commit-Ready: ChromeOS CL Exonerator Bot <fa429e5907f00867f797423aea74327bb02c91b6@appspot.gserviceaccount.com>
Reviewed-by: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@chromium.org>
Reviewed-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>

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