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We always use the lowest N channels of stream. So, set ch_mask to
GENMASK(params_channels(params) - 1, 0).
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://msgid.link/r/20240402151828.175002-6-pierre-louis.bossart@linux.intel.com

Signed-off-by: Mark Brown <broonie@kernel.org>