MFC r272109, r272181:

MFC r272109, r272181:

  Replace multiple nearly-identical copies of code to walk through an FDT
  node's interrupts=<...> property creating resource list entries with a
  single common implementation.  This change makes ofw_bus_intr_to_rl() the
  one true copy of that code and removes the copies of it from other places.

  This also adds handling of the interrupts-extended property.

git-svn-id: svn://svn.freebsd.org/base/stable/10@273675 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f