MAINTAINERS: Update Chun-Kuang Hu's email address

Update my email address to @kernel.org
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: CK Hu <ck.hu@mediatek.com>

MAINTAINERS

@@ -5607,7 +5607,7 @@ F:	include/uapi/drm/lima_drm.h
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 
 DRM DRIVERS FOR MEDIATEK
-M:	CK Hu <ck.hu@mediatek.com>
+M:	Chun-Kuang Hu <chunkuang.hu@kernel.org>
 M:	Philipp Zabel <p.zabel@pengutronix.de>
 L:	dri-devel@lists.freedesktop.org
 S:	Supported