mb/google/poppy: add the smi_events back

mb/google/poppy: add the smi_events back

Before entering the OS, the AP relies on the smi handler to shutdown the
system when the lid closes. Without the smi_events setting, the AP will
not receive the smi handler. As a result, the AP won't shutdown and will
always keep in S0.
This problem is caused by the https://review.coreboot.org/c/coreboot/+/28983
and this patch adds the smi_events back to support the smi handler for
the lid close.

BRANCH=master
BUG=b:115572596
TEST=test_that -b ${BOARD} ${IP} firmware_ECLidShutdown

Change-Id: Id82311a8ccd109f9c26516f59a45bdf34da98529
Signed-off-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-on: https://review.coreboot.org/29191
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>