cuda: fix conflict statements for x86-64 targets (#13472)
cuda: fix conflict statements for x86-64 targets (#13472)

* cuda: fix conflict statements for x86-64 targets

fixes #13462

This build system mixin was not updated after the support for specific
targets has been merged.

* Updated the version range of cuda that conflicts with gcc@8:

* Updated the version range of cuda that conflicts with gcc@8: for ppc64le

* Relaxed conflicts for version > 10.1

* Updated versions in conflicts

Co-Authored-By: Axel Huebl <02c4e323bbd7725166599555105b52ee0948d12d@plasma.ninja>

iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack