IOMMU: patch certain indirect calls to direct ones

IOMMU: patch certain indirect calls to direct ones

This is intentionally not touching hooks used rarely (or not at all)
during the lifetime of a VM, unless perhaps sitting on an error path
next to a call which gets changed (in which case I think the error
path better remains consistent with the respective main path).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>