- Cleanup the read/write check routines for pfm_write_pmcs,
  pfm_write_pmds, pfm_read_pmds.

- Autodetect the PMU model. No need to have the kernel compiled for
  Itanium, HP Simulator, or Itanium2. The support for all PMU models
  is included.  Probing is based on processor family and
  platform_name, if necessary.  With this patch, it is possible to use
  an Itanium2 compiled kernel on an Itanium 1 system and get perfmon
  to work.

- Removed remaining dependency on CONFIG_MCKINLEY by adding a new
  field (flags) to pmu_config_t.  Update /proc/perfmon to show the new
  field.

- Fixed a bug in the Itanium2 pmc_ita2_write_check() where an inactive
  PMC13 would be considered active.