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The UID field in snd_soc_acpi_link_adr is not documented, add kernel doc
for it.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230803162312.117771-1-ckeepax@opensource.cirrus.com

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