ASoC: imx-hdmi-dma: Remove unnecessary double condition check.

Signed-off-by: Rudi <r.ihle@s-t.de>
ASoC: imx-hdmi-dma: Fix md optimize subframe assembly.

Do not include unused bits of pcm_data in parity calculation and
avoid make better use of odd_ones().

Signed-off-by: Rudi <r.ihle@s-t.de>