mm-video: Recognise "OMX.qcom.video.decoder.divx4" when setting role

Setting the component role for the "OMX.qcom.video.decoder.divx4"
component triggered an incorrect claiming that the component wasn't
recognised. This is a valid component.

Change-Id: Ib58ef8d74dcaaf6bde4bc4a07adca400822e0a11