utils: gen-controls: Improve YAML notation for variable-size array controls

Array controls specify the array size through the YAML 'size' element,
which stores a list of values, one per dimension. Variable-size arrays
currently use an empty 'size' list, which prevents describing the number
of dimensions of the array.

Improve this by using the same notation for fixed-size and variable-size
array controls. Dimensions that are not fixed are described as a string
instead of an integer, such as [n], [n,3] or [w,h]. The strings have
currently no special meaning, this may change in the future.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

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