ipc: fix sleep in atomic context during reboot

ipc: fix sleep in atomic context during reboot

BZ: 34240

Currently we use intel_scu_ipc_simple_command() to send reset
command to SCU. If panic happens and reboot, there might be sleep
in atomic context. This patch fixes this issue.

Change-Id: Icb9fd26e0ac7e497679bc4090b68d4e8b7dcf35c
Signed-off-by: Li, Ning <ning.li@intel.com>
Reviewed-on: http://android.intel.com:8080/47366
Reviewed-by: Chen, Jie D <jie.d.chen@intel.com>
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Reviewed-by: Yang, Bin <bin.yang@intel.com>
Reviewed-by: Du, Alek <alek.du@intel.com>
Tested-by: Tang, HaifengX <haifengx.tang@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>