volteer: Enable EFS2
volteer: Enable EFS2

This patch enables EFS2 for volteer.

BUG=b:152998236
BRANCH=none
TEST=Verify system boots and software sync works.

Signed-off-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Change-Id: I7af9f0c5abbda4fea613d39c1981f5995acf76b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2196955
Reviewed-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@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