add Spinel SPI interface support am: 7ae6d6f4 am: 7e9e8e97 am: 0191fa36 am: 9c6ef309

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2648140



Change-Id: I00ec6e466fa051d5a01016bb81a2fdf70c276282
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>