dt-bindings: add document for rk3126-vop

Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1510658855-90223-1-git-send-email-hjc@rock-chips.com
1 file changed