soc/mediatek/mt8186: Add SSPM firmware

Add sspm.bin to support suspend/resume.

BUG=b:202871018
TEST=build pass

Change-Id: Iae24878e1812c1e9e39ce8151c59e0ec2f234031
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/blobs/+/3351461
Tested-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
4 files changed