[libcamera-devel] fix ControlInfo for Span Controls

[Christian Rauch]

Hello,

The attached patch fixes the ControlInfo access of Span Control (see
https://bugs.libcamera.org/show_bug.cgi?id=101).

The ControlInfo for Spans was defined in scalar values (i.e. single
values instead of arrays). Thus, while a Control was defined as Span,
its corresponding ControlInfo was defined as scalar, causing access errors.

Best,
Christian
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