oci/caps: remove hack for RHEL6 kernels
oci/caps: remove hack for RHEL6 kernels

We no longer support these kernels, so we can remove the workaround

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

thaJeztah/docker,docker/docker,gnailuy/docker,paralin/docker,konstruktoid/docker-upstream,nawawi/docker,djs55/docker,jthelin/docker,bearstech/moby,Mokolea/docker,nawawi/docker,trebonian/docker,moby/moby,paralin/docker,nalind/docker,gnailuy/docker,nawawi/docker,flavio/docker,cpuguy83/docker,gnailuy/docker,moby/moby,nalind/docker,thaJeztah/docker,flavio/docker,docker/docker,yosifkit/docker,paralin/docker,moul/docker,yosifkit/docker,thaJeztah/docker,jameszhan/docker,Ramzec/docker,mahak/docker,nawawi/docker,jimjag/docker,cpuguy83/docker,konstruktoid/docker-upstream,Mokolea/docker,jthelin/docker,Mokolea/docker,thaJeztah/docker,trebonian/docker,flavio/docker,konstruktoid/docker-upstream,Ramzec/docker,moul/docker,djs55/docker,Ramzec/docker,konstruktoid/docker-upstream,trebonian/docker,vdemeester/docker,bearstech/moby,jimjag/docker,jimjag/docker,gnailuy/docker,mahak/docker,paralin/docker,moul/docker,moby/moby,nalind/docker,docker/docker,nalind/docker,jameszhan/docker,Mokolea/docker,moby/moby,vdemeester/docker,bearstech/moby,yosifkit/docker,moul/docker,jameszhan/docker,cpuguy83/docker,Ramzec/docker,bearstech/moby,flavio/docker,mahak/docker,jimjag/docker,trebonian/docker,mahak/docker,djs55/docker,vdemeester/docker,yosifkit/docker,cpuguy83/docker