[sf] Fix wakeup related to CE#needsAnotherUpdate

Layers track if they have a frame ready to be latched using
hasReadyFrame. Once the buffer is latched for a layer,
the states are cleared so hasReadyFrame is only true
if we have another buffer to be latched (not possible)
or if the auto refresh flag is set. In post composition,
this flag is checked to schedule a commit.

With the new frontend, we update the snapshot
once every commit. This means hasReadyFrame
should only track the auto refresh state.

Bug: 238781169
Test: atest android.graphics.cts.FrameRateOverrideTest#testAppBackpressure --rerun-until-failure with mixed gsi builds

Change-Id: I73fe6d69c5f34e4ce5d0efc6b7f39ae72c50b8aa