media: rzg2l-cru: video: Implement .link_validate() callback

Implement the `.link_validate()` callback for the video node and move the
format checking into this function. This change allows the removal of
`rzg2l_cru_mc_validate_format()`.

Note, the fmt.format.code and fmt.format.field checks have be dropped as
the subdev .set_fmt() handler ensures that those fields always hold valid
values.

Suggested-by: Laurent Pinchart <[email protected]>
Signed-off-by: Lad Prabhakar <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Laurent Pinchart <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

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