virt-host-validate: Fix warning for IOMMU detection on PPC
virt-host-validate: Fix warning for IOMMU detection on PPC

Fix the warning generated on PPC by virt-host-validate for IOMMU.
In case of PPC, IOMMU in the host kernel either has it or it's not
compiled in. The /sys/kernel/iommu_groups check is good enough to
verify if it was compiled with the kernel or not.

Modify the error message when "if (sb.st_nlink <= 2)" to indicate
what the problem would be since there would be no @bootarg.

Signed-off-by: Nitesh Konkar <0c76797a2b22fdb43818c29f9111edd281fa1e01@linux.vnet.ibm.com>

fabianfreyer/libvirt,nertpinx/libvirt,eskultety/libvirt,nertpinx/libvirt,jfehlig/libvirt,zippy2/libvirt,jardasgit/libvirt,jfehlig/libvirt,nertpinx/libvirt,jfehlig/libvirt,libvirt/libvirt,nertpinx/libvirt,crobinso/libvirt,andreabolognani/libvirt,zippy2/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,eskultety/libvirt,nertpinx/libvirt,libvirt/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jardasgit/libvirt,andreabolognani/libvirt,olafhering/libvirt,jardasgit/libvirt,olafhering/libvirt,zippy2/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,olafhering/libvirt,andreabolognani/libvirt,crobinso/libvirt,crobinso/libvirt,eskultety/libvirt,libvirt/libvirt,jardasgit/libvirt,eskultety/libvirt,jfehlig/libvirt,crobinso/libvirt,libvirt/libvirt,andreabolognani/libvirt,olafhering/libvirt,eskultety/libvirt,jardasgit/libvirt