On multi-node systems only the first CPU node was recognized in the
signal consumer list, causing fallback to non-interrupt signals.
Change-Id: I9bd0706bafbe046be9d7f210d05fa4cf1fcd16fa
Querying HSA_AMD_AGENT_MEMORY_POOL_INFO_LINK_INFO between a gpu agent
and its own local memory pool returns a wrong information.
Fix: return link with 0 hop count.
[git-p4: depot-paths = "//depot/stg/hsa/drivers/hsa/runtime/": change = 1257544]