gstreamer openmax package provides supports for gstreamer application to use openmax api (which uses TI dsp codecs). But support for every codec in gstreamer openmax is included also in gstreamer dsp package, so there is absolutely no need to have gstreamer openmax package installed. Moreover gstreamer openmax is incompatible with new dsp codecs, so it must be removed.

So except non working TI codecs, removing openmax package does not have any other effect :-)