Don't load nonplat_service_contexts on full-treble.

On full Treble devices, servicemanager should only
host services served from processes on /system; don't load
nonplat_service_contexts.

Bug: 36866029
Test: builds, boot Taimen, boot Sailfish
Change-Id: Ia093c4c6b342335e35648db35e340e2df54fdcf3
2 files changed