- Bring in constants for 8259A registers from amd64 with some updated   comments from NetBSD's dev/ic/i8259A.h.  These bits really belong in   a file of the same name as well, but this will do for now. - Axe unused HWI_MASK.
- Bring in constants for 8259A registers from amd64 with some updated
  comments from NetBSD's dev/ic/i8259A.h.  These bits really belong in
  a file of the same name as well, but this will do for now.
- Axe unused HWI_MASK.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase