Add util function for reading OBU type.
This began as an investigation into decoder_peek_si() and decoder_peek_si_internal(). Both functions need additional changes to function correctly, but since existing code and tests depends on current behavior the changes to those functions have been deferred and the required updates noted in TODOs and comments within decoder_peek_si_internal() within av1_dx_iface.c. BUG=aomedia:1445 Change-Id: I89ee3f1a7adcf7c09938645d3fb2280ab1960698
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