media: dt-bindings: media: mtk-vcodec: Add binding for MT8192 VENC

Updates binding document for mt8192 encoder driver.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Irui Wang <irui.wang@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/devicetree/bindings/media/mediatek-vcodec.txt

@@ -9,6 +9,7 @@ Required properties:
   "mediatek,mt8173-vcodec-enc" for mt8173 avc encoder.
   "mediatek,mt8183-vcodec-enc" for MT8183 encoder.
   "mediatek,mt8173-vcodec-dec" for MT8173 decoder.
+  "mediatek,mt8192-vcodec-enc" for MT8192 encoder.
 - reg : Physical base address of the video codec registers and length of
   memory mapped region.
 - interrupts : interrupt number to the cpu.