avtka: add grid handling to virtualized uis
avtka: add grid handling to virtualized uis

Currently only a single grid is supported by AVTKA,
due to limitations in the id_to_ctlra_t struct. This
can be expanded / improved to handle multiple grids
at the cost of some complexity.

Signed-off-by: Harry van Haaren <6e1296516ee88185cd60d9725251227ece1af74d@gmail.com>

openAVproductions/openAV-Ctlra