[hwtable] fix old style getprio for IBM hardware
[hwtable] fix old style getprio for IBM hardware

This issue failed the build. Note to contributers, upstream has a
changed its way to specify prioritizers and checkers (.so) :

.getprio => .prio_name
.checker_index => .checker_name

unakatsuo/multipath-tools,vijaychauhan/multipath-tools,grzn/multipath-tools-explained,grzn/multipath-tools-explained,unakatsuo/multipath-tools,vijaychauhan/multipath-tools,gebi/multipath-tools,unakatsuo/multipath-tools