Add Trusty smc call to retrieve SMP mode am: c5cc112158

Original change: https://android-review.googlesource.com/c/trusty/lk/trusty/+/2767960

Change-Id: I9024e5b2e39c32e3541836005dc27fe2bb81ce60
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>