media: dt-bindings: ov8856: Assign maintainership to myself

Dongchun's e-mail mailbox is no longer available, assign the
maintainership to myself.

	The following message to <dongchun.zhu@mediatek.com> was
	undeliverable. The reason for the problem: 5.1.0 - Unknown address
	error 550-'Relaying mail to dongchun.zhu@mediatek.com is not
	allowed'

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>