MAINTAINERS: update dongwoon,dw9807-vcm.yaml reference

Changeset a1f4626b ("media: dt-bindings: Convert Dongwoon dw9807-vcm bindings to json-schema")
renamed: Documentation/devicetree/bindings/media/i2c/dongwoon,dw9807-vcm.txt
to: Documentation/devicetree/bindings/media/i2c/dongwoon,dw9807-vcm.yaml.

Update its cross-reference accordingly.

Fixes: a1f4626b

 ("media: dt-bindings: Convert Dongwoon dw9807-vcm bindings to json-schema")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/89f11772dd4afe9700d6cbbb3da8749eb98b396a.1654529011.git.mchehab@kernel.org