media: mediatek: vcodec: Fix decoder v4l2 bus_info not correctly

Fix v4l2 capability bus_info value with correct chip name according to
compatible.

Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>