add Spinel SPI interface support am: 7ae6d6f4ff

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

Change-Id: Ia2c45e6fa5ab5c50f888317b3f526649347607eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>