BufferQueues: clean up ConsumerBase constructors (screenrecord)

These currently use flags that muddy up client code. We've added nice
new *::create methods, so lets use those and clean
things up.

BYPASS_IGBP_IGBC_API_REASON=warren buffers

Bug: 398822412
Flag: EXEMPT refactor
Test: builds, presubmit
Change-Id: Id7872308b0045bcf00617712a89fc03dcd896091