This removes the shim interface that allowed bwn(4) to use either siba_bwn(4) or bhnd(4), replacing all siba_bwn(4) calls with their bhnd(4) bus equivalents.
- Group Reviewers
- rS328912: bwn(4): migrate bwn(4) to the native bhnd(9) interface, and drop siba_bwn.
- Merge latest bhnd(4)/bwn(4) bug fixes from HEAD.
- Do not attempt to access DMA engine registers prior to performing a core reset; this fixes a machine check exception on PowerPC systems.