ASoC: hdac_hdmi: Update sig_bits based on converter capability

ASoC: hdac_hdmi: Update sig_bits based on converter capability

When creating the codec dai, use sig_bits to update the max bps based
on the codec capability. So both the link DMA and codec format will be
calculated based on DAI sig_bits.

So update the sig_bits with converter capability and use the sig_bits
for HDA format calculation.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>