QNX delayed audio

Playing audio with QSound::play() in QNX results in a significant delay, which is roughly a second. After debugging, it was determined that the fragmentSize for params.buf.block.frag_size in qnxaudioutils.cpp, line 52 is being set too high.

This occurs with QNX SDP 7.1 running on a Zynq Unltrascale+ SoC, specifically part # XCZU4EV-1SFVC784E.