Start submitting buffers during idle->executing transition

Having the reflector thread started after transitioning to
Executing state could be too late in updating the input buffers.

Bug: 243122625
Test: atest android.media.cts.SurfaceEncodeTimestampTest
Change-Id: I95e3300217f3c4c24f6c158b022640c1e4108d2a
1 file changed