media: MAINTAINERS: Correct file entry in WAVE5 VPU CODEC DRIVER

Commit 26dde1be ("media: chips-media: wave5: Add wave5 driver to
maintainers file") adds the MAINTAINERS section WAVE5 VPU CODEC DRIVER
referring to the 'cnm,wave5.yaml' media devicetree binding, but the file
actually added in the commit de4b9f7e ("dt-bindings: media: wave5: add
yaml devicetree bindings") is named 'cnm,wave521c.yaml'.

Correct the file entry in WAVE5 VPU CODEC DRIVER.

Fixes: 26dde1be ("media: chips-media: wave5: Add wave5 driver to maintainers file")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>