media: MAINTAINERS: Add linux-renesas-soc mailing list to renesas JPU

'linux-renesas-soc' is the mailing list for renesas SOC driver,
so add it to renesas JPU driver info.

Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>