Poppy: Enter/exit from S0ix based on host commands from kernel

This patch enables the entry/exit model for S0ix based on host
commands. The kernel will send host events on kernel freeze/thaw exit;
EC will initiate the S0ix entry based on host command and exit via
another host command from kernel.

BRANCH=none
BUG=b:36630881
TEST=Build/flash EC and check 'echo freeze > /sys/power/state'
command in OS shell. Verify EC goes to S0ix state, and on wake
it comes back to S0 state.

Change-Id: I22405021aead8488a5a1f166400cbde76faac59b
Signed-off-by: Subramony Sesha <subramony.sesha@intel.com>
Signed-off-by: Archana Patni <archana.patni@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/446219
Commit-Ready: Archana Patni <archana.patni@intel.corp-partner.google.com>
Tested-by: Archana Patni <archana.patni@intel.corp-partner.google.com>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
3 files changed