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1e6920c33b
The drm format modifier value `0` is actually `DRM_FORMAT_MOD_LINEAR`,
a commonly used modifier. Unfortunately there appears to be no value
that can savely used as placeholder for "no value", as e.g.
`DRM_FORMAT_MOD_INVALID` is often used to indicate an implicit modifier.
Thus add an extra field that clearly indicates whether the modifier
value is set or not, add it to the util fuctions and use it for the
current only user, the libcamera backend.
Fixes
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