Addition of no entropy coding option in LFE

Currently LFE only does Arithmetic coding and does not have a fallback option to do no entropy coding to maintain low LFE bitrate in corner cases. With this ticket, a no entropy coding option is being added to LFE. LFE will choose either arithmetic coded bits OR no entropy coded bits based on the number of bits required by both methods. This change adds 1 bit to the bitstream to indicate entropy coding vs no entropy coding.