allow qemu_props to set opengles.version

Addresses the following denial:

  init: avc:  denied  { set } for property=opengles.version scontext=u:r:qemu_props:s0 tcontext=u:object_r:default_prop:s0 tclass=property_service

Bug: 25148690
Change-Id: I4b197eeabfe37e794104e4e686e9e388b5bc3e0c