ASoC: renesas, rsnd: Update file path

The "sound/soc/sh" directory has been renamed to "sound/soc/renesas".
Update the reference in renesas,rsnd.txt to reflect the new file path
for consistency.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/20241025150511.722040-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: prabhakarlad

Documentation/devicetree/bindings/sound/renesas,rsnd.txt

@@ -109,7 +109,7 @@ For more detail information, see below
 	  - Register Description
 	   - CTUn Scale Value exx Register (CTUn_SVxxR)
 
-	${LINUX}/sound/soc/sh/rcar/ctu.c
+	${LINUX}/sound/soc/renesas/rcar/ctu.c
 	 - comment of header
 
 You need to use "simple-scu-audio-card" or "audio-graph-scu-card" for it.