MAINTAINERS: Add entry for Renesas R-Car and FSI ASoC drivers

Add a new entry to the MAINTAINERS file for Renesas R-CAR and FSI ASoC
drivers.

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/20241025150511.722040-5-prabhakar.mahadev-lad.rj@bp.renesas.com


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