dt-bindings: display: mediatek: dsi: remove Xinlei's mail

Xinlei Lee's mail is bouncing:

<xinlei.lee@mediatek.com>: host mailgw02.mediatek.com[216.200.240.185] said:
    550 Relaying mail to xinlei.lee@mediatek.com is not allowed (in reply to
    RCPT TO command)

Remove it.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231123134927.2034024-1-mwalle@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Author: mwalle

Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.yaml

@@ -10,7 +10,6 @@ maintainers:
   - Chun-Kuang Hu <chunkuang.hu@kernel.org>
   - Philipp Zabel <p.zabel@pengutronix.de>
   - Jitao Shi <jitao.shi@mediatek.com>
-  - Xinlei Lee <xinlei.lee@mediatek.com>
 
 description: |
   The MediaTek DSI function block is a sink of the display subsystem and can