dt-bindings: display: mediatek: get mipitx calibration data from nvmem

Add properties to get get mipitx calibration data.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>