Work around SDMA hang in non-SPX modes for non-APU devices by disabling
ganging.
Root cause of hang not found.
non-APU xGMI modes have only 1 link between socket devices anyways so
there's likely no real system level gain in ganging intra-socket.
Change-Id: Ia4eda2f85cbf25151d3dbcf50cc45b8b775c60e2
Jonathan Kim
ed462035fa