Add additional flag for FMQ SF

This flag helps decouple the SF FMQ rollout from the rest of the FMQ
rollout

Bug: 284324521
Bug: 315894228
Flag: com.android.graphics.surfaceflinger.flags.adpf_fmq_sf
Flag: android.os.adpf_use_fmq_channel_fixed
Test: atest PowerAdvisorTest
Change-Id: I101fb3861fb7c03c5d070c065acf1069bf90ccc6