doc/faq: Add answer on how to fall back to surfaceflinger
doc/faq: Add answer on how to fall back to surfaceflinger

setrofim/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,ARM-software/workload-automation,setrofim/workload-automation