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powerpc64: Add DSCR support

Summary:
Powerpc64 has support for a register called Data Stream Control Register
(DSCR), which basically controls how the hardware controls the caching and
prefetch for stream operations.

Since mfdscr and mtdscr are privileged instructions, we need to emulate them,
and
keep the custom DSCR configuration per thread.

The purpose of this feature is to change DSCR depending on the operation, set
to DSCR Default Prefetch Depth to deepest on string operations, as memcpy.

Submitted by:   Breno Leitao
Differential Revision: https://reviews.freebsd.org/D15081

UnifiedSplitRaw

Major overhaul of sunlabel(8).

. Implement option -c, all partition sizes will be calculated
  in cylinders as opposed to sectors.  Since the Sun label is
  inherently cylinder-based, this makes the job a little easier.

. Implement option -h, print the label in `human readable'
  size/offset format.

. Implement SVR4-compatible VTOC-style elements.  They are
  fully optional, defaulting to the current behaviour where no
  VTOC-style table will be written to disk.  However, if
  desired, the full functionality of the partitioning menu of
  Solaris' format(1m) is now offered (and even more).

. When editing the label, do not loop around edit_label() where
  a new template file is generated for each turn, this used to
  be annoying in that any possible syntax error caused a
  complaint, but then the template was created anew, so the
  user had to perform all their editing again.  Rather loop
  inside edit_label(), similar to bsdlabel(8), so in case of
  errors, the user will be presented their previous template
  file again.

. If VTOC-style elements are present, the overlap checks are
  made less stringent.  Overlaps will still be warned about,
  but overlaps of `unmountable' partitions against other ones
  are no longer fatal.  That way, e. g. VxVM encapsulated
  disk labels can be fully edited in FreeBSD (but not in
  Solaris ;-).

. In print_label(), generate the editing hints only if the -e
  flag is in effect.  Additionally, print a hint about the
  total number of sectors in the (hardware) medium.

. When editing a label, allow for changing the geometry
  emulation (and textual name) by modifying the "text:" line
  on top.  That way, a more effective emulation can be
  chosen.

. When editing/reading a label, additionally allow for the
  suffixes `s' (512-byte sectors), and `c' (cylinders) in the
  partition size field.

. Finally, turn the stub man page into something that really
  explains the entire thing.

UnifiedSplitRaw