ASoC: Documentation: fix reference to renamed source file

sound/soc/soc-io.c was merged into sound/soc/soc-component.c, so fixup
the Documentation to use the updated file name.

Error: Cannot open file ../sound/soc/soc-io.c
WARNING: kernel-doc '../scripts/kernel-doc -rst -enable-lineno ../sound/soc/soc-io.c' failed with return code 1

Fixes: 460b42d1 ("ASoC: soc-component: merge soc-io.c into soc-component.c")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/a9f59f30-8cf2-ea82-567c-1706fd64fe62@infradead.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/sound/kernel-api/alsa-driver-api.rst

@@ -99,7 +99,7 @@ ASoC Core API
 .. kernel-doc:: include/sound/soc.h
 .. kernel-doc:: sound/soc/soc-core.c
 .. kernel-doc:: sound/soc/soc-devres.c
-.. kernel-doc:: sound/soc/soc-io.c
+.. kernel-doc:: sound/soc/soc-component.c
 .. kernel-doc:: sound/soc/soc-pcm.c
 .. kernel-doc:: sound/soc/soc-ops.c
 .. kernel-doc:: sound/soc/soc-compress.c