media: mtk-vcodec: Support MT8192

Adds MT8192's compatible "mediatek,mt8192-vcodec-dec".
Adds MT8192's device private data mtk_lat_sig_core_pdata.

Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>