power: Init host_sleep_event resume_transitions
power: Init host_sleep_event resume_transitions

I had missed a piece of feedback from Karthik about initializing
the sleep transitions member of the resume response to avoid
returning uninitialized data from the EC. This is especially important
if CONFIG_POWER_S0IX_FAILURE_DETECTION is not selected, because then
it will *always* return uninitialized data. This drives the kernel nuts,
since it has no way to know if that config is on or not.

BUG=b:123716513
BRANCH=none
TEST=Test suspend with kernel support for this message, and the
EC config both on and off.

Change-Id: Id35bfe2730327b08f451a4d84277a13e47380a61
Signed-off-by: Evan Green <e00bb247ee1d736884e1d54ef0d6b838cb86c075@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1551687
Commit-Ready: ChromeOS CL Exonerator Bot <fa429e5907f00867f797423aea74327bb02c91b6@appspot.gserviceaccount.com>
Reviewed-by: Tim Wawrzynczak <86444811eee8c2cb29e29a251d7a069e64ccc665@chromium.org>
Reviewed-by: Furquan Shaikh <6be5c96c464778f89679b1062a2e0a6af93d2aa5@chromium.org>
Reviewed-by: Paul Fagerburg <d8c44b60afb21c60f56d931aa690ca1cf34910c8@chromium.org>

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