opencl: rename OS object to openclXpY
opencl: rename OS object to openclXpY

We need an easy way to translate from platform/device index 
to these objects. So rename the objects to opencl<device>p<platform>
instead of opencl<globalbutmeaninglessindex>

This commit was SVN r5160.

shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc