media: rc: mtk-cir: add MAINTAINERS entry for MediaTek CIR driver

I work for MediaTek on maintaining the MediaTek CIR driver
for the existing SoCs and adding support for the following
SoCs.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>