PCI: hv: Use list_for_each_entry()

There are several places where list_for_each_entry() could be
used to simplify the code.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>