dt-bindings: display: msm: dp: update maintainer entry

Add myself as maintainer for dp controller yaml as to support
review of the incoming changes.

Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/626921/
Link: https://lore.kernel.org/r/20241202-dp_mst_bindings-v1-4-9a9a43b0624a@quicinc.com


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>